Method and apparatus for selecting resources based on partial sensing in nr v2x

ABSTRACT

A method for a first device to perform wireless communication and an apparatus supporting the same are provided. The method comprises, triggering resource selection in a first slot; determining a time interval of a selection window from the first slot based on a remaining packet delay budget (PDB), wherein the selection window includes Y candidate slots; performing sensing for L slots after the first slot; selecting at least one resource for sidelink (SL) transmission within the selection window based on the sensing for the L slots; transmitting, to a second device through a physical sidelink control channel (PSCCH), a first sidelink control information (SCI) for scheduling of a physical sidelink shared channel (PSSCH) and a second SCI; and transmitting, to the second device through the PSSCH, the second SCI and data.

CROSS-REFERENCE TO RELATED APPLICATIONS

Pursuant to 35 U.S.C. § 119(e), this application claims the benefit ofU.S. Provisional Patent Application Nos. 63/136,613 filed on Jan. 12,2021, 63/138,713 filed on Jan. 18, 2021, 63/138,781 filed on Jan. 18,2021, 63/141,957 filed on Jan. 26, 2021, 63/143,926 filed on Jan. 31,2021, and 63/143,947 filed on Jan. 31, 2021, the contents of all ofwhich are hereby incorporated by reference herein in their entireties.

BACKGROUND OF THE DISCLOSURE Field of the Disclosure

This disclosure relates to a wireless communication system.

Related Art

Sidelink (SL) communication is a communication scheme in which a directlink is established between User Equipments (UEs) and the UEs exchangevoice and data directly with each other without intervention of anevolved Node B (eNB). SL communication is under consideration as asolution to the overhead of an eNB caused by rapidly increasing datatraffic. Vehicle-to-everything (V2X) refers to a communicationtechnology through which a vehicle exchanges information with anothervehicle, a pedestrian, an object having an infrastructure (or infra)established therein, and so on. The V2X may be divided into 4 types,such as vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V21),vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). The V2Xcommunication may be provided via a PC5 interface and/or Uu interface.

Meanwhile, as a wider range of communication devices require largercommunication capacities, the need for mobile broadband communicationthat is more enhanced than the existing Radio Access Technology (RAT) isrising. Accordingly, discussions are made on services and user equipment(UE) that are sensitive to reliability and latency. And, a nextgeneration radio access technology that is based on the enhanced mobilebroadband communication, massive Machine Type Communication (MTC),Ultra-Reliable and Low Latency Communication (URLLC), and so on, may bereferred to as a new radio access technology (RAT) or new radio (NR).Herein, the NR may also support vehicle-to-everything (V2X)communication.

FIG. 1 is a drawing for describing V2X communication based on NR,compared to V2X communication based on RAT used before NR. Theembodiment of FIG. 1 may be combined with various embodiments of thepresent disclosure.

Regarding V2X communication, a scheme of providing a safety service,based on a V2X message such as Basic Safety Message (BSM), CooperativeAwareness Message (CAM), and Decentralized Environmental NotificationMessage (DENM) is focused in the discussion on the RAT used before theNR. The V2X message may include position information, dynamicinformation, attribute information, or the like. For example, a UE maytransmit a periodic message type CAM and/or an event triggered messagetype DENM to another UE.

Thereafter, regarding V2X communication, various V2X scenarios areproposed in NR. For example, the various V2X scenarios may includevehicle platooning, advanced driving, extended sensors, remote driving,or the like.

SUMMARY OF THE DISCLOSURE Technical Objects

Meanwhile, there may be a case in which the P-UE performing partialsensing is not guaranteed the minimum number of slots required forsensing. Specifically, for example, the P-UE shall determine the endtime of the selection window in consideration of the packet delay budget(PDB), and the P-UE shall select Y candidate slots more than a minimumnumber within the selection window. In this case, if the PDB is tight orthe number of Y candidate slots is large, the P-UE may not be guaranteedthe minimum number of slots required for sensing. Therefore, when theP-UE is not guaranteed the minimum number of slots required for sensing,a method for resource selection of the P-UE needs to be defined.

Technical Solutions

According to an embodiment, a method for performing wirelesscommunication by a first device may be provided. The method maycomprise: triggering resource selection in a first slot; determining atime interval of a selection window from the first slot based on aremaining packet delay budget (PDB), wherein the selection windowincludes Y candidate slots; performing sensing for L slots after thefirst slot; selecting at least one resource for sidelink (SL)transmission within the selection window based on the sensing for the Lslots; transmitting, to a second device through a physical sidelinkcontrol channel (PSCCH), a first sidelink control information (SCI) forscheduling of a physical sidelink shared channel (PSSCH) and a secondSCI; and transmitting, to the second device through the PSSCH, thesecond SCI and data; wherein, based on the L being smaller than aminimum number of slots for the sensing, the at least one resource isselected based on random selection within the selection window, or theat least one resource is selected from the Y candidate slots based onthe sensing for the L slots, wherein the Y is a positive integer, andwherein the L is a positive integer.

storing instructions; one or more transceivers; and one or moreprocessors connected to the one or more memories and the one or moretransceivers. For example, the one or more processors execute theinstructions to: trigger resource selection in a first slot; determine atime interval of a selection window from the first slot based on aremaining packet delay budget (PDB), wherein the selection windowincludes Y candidate slots; perform sensing for L slots after the firstslot; select at least one resource for sidelink (SL) transmission withinthe selection window based on the sensing for the L slots; transmit, toa second device through a physical sidelink control channel (PSCCH), afirst sidelink control information (SCI) for scheduling of a physicalsidelink shared channel (PSSCH) and a second SCI; and transmit, to thesecond device through the PSSCH, the second SCI and data; wherein, basedon the L being smaller than a minimum number of slots for the sensing,the at least one resource is selected based on random selection withinthe selection window, or the at least one resource is selected from theY candidate slots based on the sensing for the L slots, wherein the Y isa positive integer, and wherein the L is a positive integer.

Effects of the Disclosure

A UE performing a power saving operation may perform an efficientresource selection operation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a drawing for describing V2X communication based on NR,compared to V2X communication based on RAT used before NR.

FIG. 2 shows a structure of an NR system, based on an embodiment of thepresent disclosure.

FIG. 3 shows a radio protocol architecture, based on an embodiment ofthe present disclosure.

FIG. 4 shows a structure of a radio frame of an NR, based on anembodiment of the present disclosure.

FIG. 5 shows a structure of a slot of an NR frame, based on anembodiment of the present disclosure.

FIG. 6 shows an example of a BWP, based on an embodiment of the presentdisclosure.

FIG. 7 shows a UE performing V2X or SL communication, based on anembodiment of the present disclosure.

FIG. 8 shows a procedure of performing V2X or SL communication by a UEbased on a transmission mode, based on an embodiment of the presentdisclosure.

FIG. 9 shows three cast types, based on an embodiment of the presentdisclosure.

FIG. 10 shows a resource unit for CBR measurement, based on anembodiment of the present disclosure.

FIG. 11 illustrates a method for a UE to perform partial sensingaccording to an embodiment of the present disclosure.

FIG. 12 illustrates a method for a UE to perform partial sensingaccording to an embodiment of the present disclosure.

FIG. 13 illustrates a method for a first device to perform wirelesscommunication, according to an embodiment of the present disclosure.

FIG. 14 shows a method for a second device to perform wirelesscommunication, according to an embodiment of the present disclosure.

FIG. 15 shows a communication system 1, based on an embodiment of thepresent disclosure.

FIG. 16 shows wireless devices, based on an embodiment of the presentdisclosure.

FIG. 17 shows a signal process circuit for a transmission signal, basedon an embodiment of the present disclosure.

FIG. 18 shows another example of a wireless device, based on anembodiment of the present disclosure.

FIG. 19 shows a hand-held device, based on an embodiment of the presentdisclosure.

FIG. 20 shows a vehicle or an autonomous vehicle, based on an embodimentof the present disclosure.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

In the present specification, “A or B” may mean “only A”, “only B” or“both A and B.” In other words, in the present specification, “A or B”may be interpreted as “A and/or B”. For example, in the presentspecification, “A, B, or C” may mean “only A”, “only B”, “only C”, or“any combination of A, B, C”.

A slash (/) or comma used in the present specification may mean“and/or”. For example, “A/B” may mean “A and/or B”. Accordingly, “A/B”may mean “only A”, “only B”, or “both A and B”. For example, “A, B, C”may mean “A, B, or C”.

In the present specification, “at least one of A and B” may mean “onlyA”, “only B”, or “both A and B”. In addition, in the presentspecification, the expression “at least one of A or B” or “at least oneof A and/or B” may be interpreted as “at least one of A and B”.

In addition, in the present specification, “at least one of A, B, and C”may mean “only A”, “only B”, “only C”, or “any combination of A, B, andC”. In addition, “at least one of A, B, or C” or “at least one of A, B,and/or C” may mean “at least one of A, B, and C”.

In addition, a parenthesis used in the present specification may mean“for example”. Specifically, when indicated as “control information(PDCCH)”, it may mean that “PDCCH” is proposed as an example of the“control information”. In other words, the “control information” of thepresent specification is not limited to “PDCCH”, and “PDCCH” may beproposed as an example of the “control information”. In addition, whenindicated as “control information (i.e., PDCCH)”, it may also mean that“PDCCH” is proposed as an example of the “control information”.

A technical feature described individually in one figure in the presentspecification may be individually implemented, or may be simultaneouslyimplemented.

The technology described below may be used in various wirelesscommunication systems such as code division multiple access (CDMA),frequency division multiple access (FDMA), time division multiple access(TDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), and so on. TheCDMA may be implemented with a radio technology, such as universalterrestrial radio access (UTRA) or CDMA-2000. The TDMA may beimplemented with a radio technology, such as global system for mobilecommunications (GSM)/general packet ratio service (GPRS)/enhanced datarate for GSM evolution (EDGE). The OFDMA may be implemented with a radiotechnology, such as institute of electrical and electronics engineers(IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, evolved UTRA(E-UTRA), and so on. IEEE 802.16m is an evolved version of IEEE 802.16eand provides backward compatibility with a system based on the IEEE802.16e. The UTRA is part of a universal mobile telecommunication system(UMTS). 3rd generation partnership project (3GPP) long term evolution(LTE) is part of an evolved UMTS (E-UMTS) using the E-UTRA. The 3GPP LTEuses the OFDMA in a downlink and uses the SC-FDMA in an uplink.LTE-advanced (LTE-A) is an evolution of the LTE.

5G NR is a successive technology of LTE-A corresponding to a newClean-slate type mobile communication system having the characteristicsof high performance, low latency, high availability, and so on. 5G NRmay use resources of all spectrum available for usage including lowfrequency bands of less than 1 GHz, middle frequency bands ranging from1 GHz to 10 GHz, high frequency (millimeter waves) of 24 GHz or more,and so on.

For clarity in the description, the following description will mostlyfocus on LTE-A or 5G NR. However, technical features according to anembodiment of the present disclosure will not be limited only to this.

FIG. 2 shows a structure of an NR system, based on an embodiment of thepresent disclosure. The embodiment of FIG. 2 may be combined withvarious embodiments of the present disclosure.

Referring to FIG. 2, a next generation-radio access network (NG-RAN) mayinclude a BS 20 providing a UE 10 with a user plane and control planeprotocol termination. For example, the BS 20 may include a nextgeneration-Node B (gNB) and/or an evolved-NodeB (eNB). For example, theUE 10 may be fixed or mobile and may be referred to as other terms, suchas a mobile station (MS), a user terminal (UT), a subscriber station(SS), a mobile terminal (MT), wireless device, and so on. For example,the BS may be referred to as a fixed station which communicates with theUE 10 and may be referred to as other terms, such as a base transceiversystem (BTS), an access point (AP), and so on.

The embodiment of FIG. 2 exemplifies a case where only the gNB isincluded. The BSs 20 may be connected to one another via Xn interface.The BS 20 may be connected to one another via 5th generation (5G) corenetwork (5GC) and NG interface. More specifically, the BSs 20 may beconnected to an access and mobility management function (AMF) 30 viaNG-C interface, and may be connected to a user plane function (UPF) 30via NG-U interface.

Layers of a radio interface protocol between the UE and the network canbe classified into a first layer (layer 1, L1), a second layer (layer 2,L2), and a third layer (layer 3, L3) based on the lower three layers ofthe open system interconnection (OSI) model that is well-known in thecommunication system. Among them, a physical (PHY) layer belonging tothe first layer provides an information transfer service by using aphysical channel, and a radio resource control (RRC) layer belonging tothe third layer serves to control a radio resource between the UE andthe network. For this, the RRC layer exchanges an RRC message betweenthe UE and the BS.

FIG. 3 shows a radio protocol architecture, based on an embodiment ofthe present disclosure. The embodiment of FIG. 3 may be combined withvarious embodiments of the present disclosure. Specifically, (a) of FIG.3 shows a radio protocol stack of a user plane for Uu communication, and(b) of FIG. 3 shows a radio protocol stack of a control plane for Uucommunication. (c) of FIG. 3 shows a radio protocol stack of a userplane for SL communication, and (d) of FIG. 3 shows a radio protocolstack of a control plane for SL communication.

Referring to FIG. 3, a physical layer provides an upper layer with aninformation transfer service through a physical channel. The physicallayer is connected to a medium access control (MAC) layer which is anupper layer of the physical layer through a transport channel. Data istransferred between the MAC layer and the physical layer through thetransport channel. The transport channel is classified according to howand with what characteristics data is transmitted through a radiointerface.

Between different physical layers, i.e., a physical layer of atransmitter and a physical layer of a receiver, data are transferredthrough the physical channel. The physical channel is modulated using anorthogonal frequency division multiplexing (OFDM) scheme, and utilizestime and frequency as a radio resource.

The MAC layer provides services to a radio link control (RLC) layer,which is a higher layer of the MAC layer, via a logical channel. The MAClayer provides a function of mapping multiple logical channels tomultiple transport channels. The MAC layer also provides a function oflogical channel multiplexing by mapping multiple logical channels to asingle transport channel. The MAC layer provides data transfer servicesover logical channels.

The RLC layer performs concatenation, segmentation, and reassembly ofRadio Link Control Service Data Unit (RLC SDU). In order to ensurediverse quality of service (QoS) required by a radio bearer (RB), theRLC layer provides three types of operation modes, i.e., a transparentmode (TM), an unacknowledged mode (UM), and an acknowledged mode (AM).An AM RLC provides error correction through an automatic repeat request(ARQ).

A radio resource control (RRC) layer is defined only in the controlplane. The RRC layer serves to control the logical channel, thetransport channel, and the physical channel in association withconfiguration, reconfiguration and release of RBs. The RB is a logicalpath provided by the first layer (i.e., the physical layer or the PHYlayer) and the second layer (i.e., a MAC layer, an RLC layer, a packetdata convergence protocol (PDCP) layer, and a service data adaptationprotocol (SDAP) layer) for data delivery between the UE and the network.

Functions of a packet data convergence protocol (PDCP) layer in the userplane include user data delivery, header compression, and ciphering.Functions of a PDCP layer in the control plane include control-planedata delivery and ciphering/integrity protection.

A service data adaptation protocol (SDAP) layer is defined only in auser plane. The SDAP layer performs mapping between a Quality of Service(QoS) flow and a data radio bearer (DRB) and QoS flow ID (QFI) markingin both DL and UL packets.

The configuration of the RB implies a process for specifying a radioprotocol layer and channel properties to provide a particular serviceand for determining respective detailed parameters and operations. TheRB can be classified into two types, i.e., a signaling RB (SRB) and adata RB (DRB). The SRB is used as a path for transmitting an RRC messagein the control plane. The DRB is used as a path for transmitting userdata in the user plane.

When an RRC connection is established between an RRC layer of the UE andan RRC layer of the E-UTRAN, the UE is in an RRC_CONNECTED state, and,otherwise, the UE may be in an RRC_IDLE state. In case of the NR, anRRC_INACTIVE state is additionally defined, and a UE being in theRRC_INACTIVE state may maintain its connection with a core networkwhereas its connection with the BS is released.

Data is transmitted from the network to the UE through a downlinktransport channel. Examples of the downlink transport channel include abroadcast channel (BCH) for transmitting system information and adownlink-shared channel (SCH) for transmitting user traffic or controlmessages. Traffic of downlink multicast or broadcast services or thecontrol messages can be transmitted on the downlink-SCH or an additionaldownlink multicast channel (MCH). Data is transmitted from the UE to thenetwork through an uplink transport channel. Examples of the uplinktransport channel include a random access channel (RACH) fortransmitting an initial control message and an uplink SCH fortransmitting user traffic or control messages.

Examples of logical channels belonging to a higher channel of thetransport channel and mapped onto the transport channels include abroadcast channel (BCCH), a paging control channel (PCCH), a commoncontrol channel (CCCH), a multicast control channel (MCCH), a multicasttraffic channel (MTCH), etc.

FIG. 4 shows a structure of a radio frame of an NR, based on anembodiment of the present disclosure. The embodiment of FIG. 4 may becombined with various embodiments of the present disclosure.

Referring to FIG. 4, in the NR, a radio frame may be used for performinguplink and downlink transmission. A radio frame has a length of 10 msand may be defined to be configured of two half-frames (HFs). Ahalf-frame may include five lms subframes (SFs). A subframe (SF) may bedivided into one or more slots, and the number of slots within asubframe may be determined based on subcarrier spacing (SCS). Each slotmay include 12 or 14 OFDM(A) symbols according to a cyclic prefix (CP).

In case of using a normal CP, each slot may include 14 symbols. In caseof using an extended CP, each slot may include 12 symbols. Herein, asymbol may include an OFDM symbol (or CP-OFDM symbol) and a SingleCarrier-FDMA (SC-FDMA) symbol (or Discrete Fourier Transform-spread-OFDM(DFT-s-OFDM) symbol).

Table 1 shown below represents an example of a number of symbols perslot (N^(slot) _(symb)), a number slots per frame (N^(frame,u) _(slot)),and a number of slots per subframe (N^(frame,u) _(slot)) based on an SCSconfiguration (u), in a case where a normal CP is used.

TABLE 1 SCS (15*2^(u)) N^(slot) _(synab) N^(frame,u) _(slot)N^(subframe,u) _(slot) 15KHz (u=0) 14 10 1 30KHz (u=1) 14 20 2 60KHz(u=2) 14 40 4 120KHz (u=3) 14 80 8 240KHz (u=4) 14 160 16

Table 2 shows an example of a number of symbols per slot, a number ofslots per frame, and a number of slots per subframe based on the SCS, ina case where an extended CP is used.

TABLE 2 SCS (15*2^(u)) N^(slot) _(synab) N^(frame,u) _(slot)N^(subframe,u) _(slot) 60KHz (u=2) 12 40 4

In an NR system, OFDM(A) numerologies (e.g., SCS, CP length, and so on)between multiple cells being integrate to one UE may be differentlyconfigured. Accordingly, a (absolute time) duration (or section) of atime resource (e.g., subframe, slot or TTI) (collectively referred to asa time unit (TU) for simplicity) being configured of the same number ofsymbols may be differently configured in the integrated cells.

In the NR, multiple numerologies or SCSs for supporting diverse 5Gservices may be supported. For example, in case an SCS is 15 kHz, a widearea of the conventional cellular bands may be supported, and, in casean SCS is 30 kHz/60 kHz a dense-urban, lower latency, wider carrierbandwidth may be supported. In case the SCS is 60 kHz or higher, abandwidth that is greater than 24.25 GHz may be used in order toovercome phase noise.

An NR frequency band may be defined as two different types of frequencyranges. The two different types of frequency ranges may be FR1 and FR2.The values of the frequency ranges may be changed (or varied), and, forexample, the two different types of frequency ranges may be as shownbelow in Table 3. Among the frequency ranges that are used in an NRsystem, FR1 may mean a “sub 6 GHz range”, and FR2 may mean an “above 6GHz range” and may also be referred to as a millimeter wave (mmW).

TABLE 3 Frequency Range designation Corresponding frequency rangeSubcarrier Spacing (SCS) FR1 450MHz−6000MHz 15, 30, 60kHz FR224250MHz−52600MHz 60, 120, 240kHz

As described above, the values of the frequency ranges in the NR systemmay be changed (or varied). For example, as shown below in Table 4, FR1may include a band within a range of 410 MHz to 7125 MHz. Morespecifically, FR1 may include a frequency band of 6 GHz (or 5850, 5900,5925 MHz, and so on) and higher. For example, a frequency band of 6 GHz(or 5850, 5900, 5925 MHz, and so on) and higher being included in FR1mat include an unlicensed band. The unlicensed band may be used fordiverse purposes, e.g., the unlicensed band for vehicle-specificcommunication (e.g., automated driving).

TABLE 4 Frequency Range designation Corresponding frequency rangeSubcarrier Spacing (SCS) FR1 410MHz−7125MHz 15, 30, 60kHz FR224250MHz−52600MHz 60, 120, 240kHz

FIG. 5 shows a structure of a slot of an NR frame, based on anembodiment of the present disclosure. The embodiment of FIG. 5 may becombined with various embodiments of the present disclosure.

Referring to FIG. 5, a slot includes a plurality of symbols in a timedomain. For example, in case of a normal CP, one slot may include 14symbols. However, in case of an extended CP, one slot may include 12symbols. Alternatively, in case of a normal CP, one slot may include 7symbols. However, in case of an extended CP, one slot may include 6symbols.

A carrier includes a plurality of subcarriers in a frequency domain. AResource Block (RB) may be defined as a plurality of consecutivesubcarriers (e.g., 12 subcarriers) in the frequency domain. A BandwidthPart (BWP) may be defined as a plurality of consecutive (Physical)Resource Blocks ((P)RBs) in the frequency domain, and the BWP maycorrespond to one numerology (e.g., SCS, CP length, and so on). Acarrier may include a maximum of N number BWPs (e.g., 5 BWPs). Datacommunication may be performed via an activated BWP. Each element may bereferred to as a Resource Element (RE) within a resource grid and onecomplex symbol may be mapped to each element.

Hereinafter, a bandwidth part (BWP) and a carrier will be described.

The BWP may be a set of consecutive physical resource blocks (PRBs) in agiven numerology. The PRB may be selected from consecutive sub-sets ofcommon resource blocks (CRB s) for the given numerology on a givencarrier

For example, the BWP may be at least any one of an active BWP, aninitial BWP, and/or a default BWP. For example, the UE may not monitordownlink radio link quality in a DL BWP other than an active DL BWP on aprimary cell (PCell). For example, the UE may not receive PDCCH,physical downlink shared channel (PDSCH), or channel stateinformation-reference signal (CSI-RS) (excluding RRM) outside the activeDL BWP. For example, the UE may not trigger a channel state information(CSI) report for the inactive DL BWP. For example, the UE may nottransmit physical uplink control channel (PUCCH) or physical uplinkshared channel (PUSCH) outside an active UL BWP. For example, in adownlink case, the initial BWP may be given as a consecutive RB set fora remaining minimum system information (RMSI) control resource set(CORESET) (configured by physical broadcast channel (PBCH)). Forexample, in an uplink case, the initial BWP may be given by systeminformation block (SIB) for a random access procedure. For example, thedefault BWP may be configured by a higher layer. For example, an initialvalue of the default BWP may be an initial DL BWP. For energy saving, ifthe UE fails to detect downlink control information (DCI) during aspecific period, the UE may switch the active BWP of the UE to thedefault BWP.

Meanwhile, the BWP may be defined for SL. The same SL BWP may be used intransmission and reception. For example, a transmitting UE may transmitan SL channel or an SL signal on a specific BWP, and a receiving UE mayreceive the SL channel or the SL signal on the specific BWP. In alicensed carrier, the SL BWP may be defined separately from a Uu BWP,and the SL BWP may have configuration signaling separate from the UuBWP. For example, the UE may receive a configuration for the SL BWP fromthe BS/network. For example, the UE may receive a configuration for theUu BWP from the BS/network. The SL BWP may be (pre-)configured in acarrier with respect to an out-of-coverage NR V2X UE and an RRC_IDLE UE.For the UE in the RRC_CONNECTED mode, at least one SL BWP may beactivated in the carrier.

FIG. 6 shows an example of a BWP, based on an embodiment of the presentdisclosure. The embodiment of FIG. 6 may be combined with variousembodiments of the present disclosure. It is assumed in the embodimentof FIG. 6 that the number of BWPs is 3.

Referring to FIG. 6, a common resource block (CRB) may be a carrierresource block numbered from one end of a carrier band to the other endthereof. In addition, the PRB may be a resource block numbered withineach BWP. A point A may indicate a common reference point for a resourceblock grid.

The BWP may be configured by a point A, an offset N^(start) _(BWP) fromthe point A, and a bandwidth N^(size) _(BWP). For example, the point Amay be an external reference point of a PRB of a carrier in which asubcarrier 0 of all numerologies (e.g., all numerologies supported by anetwork on that carrier) is aligned. For example, the offset may be aPRB interval between a lowest subcarrier and the point A in a givennumerology. For example, the bandwidth may be the number of PRBs in thegiven numerology.

Hereinafter, V2X or SL communication will be described.

A sidelink synchronization signal (SLSS) may include a primary sidelinksynchronization signal (PSSS) and a secondary sidelink synchronizationsignal (SSSS), as an SL-specific sequence. The PSSS may be referred toas a sidelink primary synchronization signal (S-PSS), and the SSSS maybe referred to as a sidelink secondary synchronization signal (S-SSS).For example, length-127 M-sequences may be used for the S-PSS, andlength-127 gold sequences may be used for the S-SSS. For example, a UEmay use the S-PSS for initial signal detection and for synchronizationacquisition. For example, the UE may use the S-PSS and the S-SSS foracquisition of detailed synchronization and for detection of asynchronization signal ID.

A physical sidelink broadcast channel (PSBCH) may be a (broadcast)channel for transmitting default (system) information which must befirst known by the UE before SL signal transmission/reception. Forexample, the default information may be information related to SLSS, aduplex mode (DM), a time division duplex (TDD) uplink/downlink (UL/DL)configuration, information related to a resource pool, a type of anapplication related to the SLSS, a subframe offset, broadcastinformation, or the like. For example, for evaluation of PSBCHperformance, in NR V2X, a payload size of the PSBCH may be 56 bitsincluding 24-bit cyclic redundancy check (CRC).

The S-PSS, the S-SSS, and the PSBCH may be included in a block format(e.g., SL synchronization signal (SS)/PSBCH block, hereinafter,sidelink-synchronization signal block (S-SSB)) supporting periodicaltransmission. The S-SSB may have the same numerology (i.e., SCS and CPlength) as a physical sidelink control channel (PSCCH)/physical sidelinkshared channel (PSSCH) in a carrier, and a transmission bandwidth mayexist within a (pre-)configured sidelink (SL) BWP. For example, theS-SSB may have a bandwidth of 11 resource blocks (RBs). For example, thePSBCH may exist across 11 RBs. In addition, a frequency position of theS-SSB may be (pre-)configured. Accordingly, the UE does not have toperform hypothesis detection at frequency to discover the S-SSB in thecarrier.

FIG. 7 shows a UE performing V2X or SL communication, based on anembodiment of the present disclosure. The embodiment of FIG. 7 may becombined with various embodiments of the present disclosure.

Referring to FIG. 7, in V2X or SL communication, the term ‘UE’ maygenerally imply a UE of a user. However, if a network equipment such asa BS transmits/receives a signal according to a communication schemebetween UEs, the BS may also be regarded as a sort of the UE. Forexample, a UE 1 may be a first apparatus 100, and a UE 2 may be a secondapparatus 200.

For example, the UE 1 may select a resource unit corresponding to aspecific resource in a resource pool which implies a set of series ofresources. In addition, the UE 1 may transmit an SL signal by using theresource unit. For example, a resource pool in which the UE 1 is capableof transmitting a signal may be configured to the UE 2 which is areceiving UE, and the signal of the UE 1 may be detected in the resourcepool.

Herein, if the UE 1 is within a connectivity range of the BS, the BS mayinform the UE 1 of the resource pool. Otherwise, if the UE 1 is out ofthe connectivity range of the BS, another UE may inform the UE 1 of theresource pool, or the UE 1 may use a pre-configured resource pool.

In general, the resource pool may be configured in unit of a pluralityof resources, and each UE may select a unit of one or a plurality ofresources to use it in SL signal transmission thereof.

Hereinafter, resource allocation in SL will be described.

FIG. 8 shows a procedure of performing V2X or SL communication by a UEbased on a transmission mode, based on an embodiment of the presentdisclosure. The embodiment of FIG. 8 may be combined with variousembodiments of the present disclosure. In various embodiments of thepresent disclosure, the transmission mode may be called a mode or aresource allocation mode. Hereinafter, for convenience of explanation,in LTE, the transmission mode may be called an LTE transmission mode. InNR, the transmission mode may be called an NR resource allocation mode.

For example, (a) of FIG. 8 shows a UE operation related to an LTEtransmission mode 1 or an LTE transmission mode 3. Alternatively, forexample, (a) of FIG. 8 shows a UE operation related to an NR resourceallocation mode 1. For example, the LTE transmission mode 1 may beapplied to general SL communication, and the LTE transmission mode 3 maybe applied to V2X communication.

For example, (b) of FIG. 8 shows a UE operation related to an LTEtransmission mode 2 or an LTE transmission mode 4. Alternatively, forexample, (b) of FIG. 8 shows a UE operation related to an NR resourceallocation mode 2.

Referring to (a) of FIG. 8, in the LTE transmission mode 1, the LTEtransmission mode 3, or the NR resource allocation mode 1, a BS mayschedule an SL resource to be used by the UE for SL transmission. Forexample, the BS may perform resource scheduling to a UE 1 through aPDCCH (e.g., downlink control information (DCI)) or RRC signaling (e.g.,Configured Grant Type 1 or Configured Grant Type 2), and the UE 1 mayperform V2X or SL communication with respect to a UE 2 according to theresource scheduling. For example, the UE 1 may transmit a sidelinkcontrol information (SCI) to the UE 2 through a physical sidelinkcontrol channel (PSCCH), and thereafter transmit data based on the SCIto the UE 2 through a physical sidelink shared channel (PSSCH).

Referring to (b) of FIG. 8, in the LTE transmission mode 2, the LTEtransmission mode 4, or the NR resource allocation mode 2, the UE maydetermine an SL transmission resource within an SL resource configuredby a BS/network or a pre-configured SL resource. For example, theconfigured SL resource or the pre-configured SL resource may be aresource pool. For example, the UE may autonomously select or schedule aresource for SL transmission. For example, the UE may perform SLcommunication by autonomously selecting a resource within a configuredresource pool. For example, the UE may autonomously select a resourcewithin a selective window by performing a sensing and resource(re)selection procedure. For example, the sensing may be performed inunit of subchannels. In addition, the UE 1 which has autonomouslyselected the resource within the resource pool may transmit the SCI tothe UE 2 through a PSCCH, and thereafter may transmit data based on theSCI to the UE 2 through a PSSCH.

FIG. 9 shows three cast types, based on an embodiment of the presentdisclosure. The embodiment of FIG. 9 may be combined with variousembodiments of the present disclosure. Specifically, (a) of FIG. 9 showsbroadcast-type SL communication, (b) of FIG. 9 shows unicast type-SLcommunication, and (c) of FIG. 9 shows groupcast-type SL communication.In case of the unicast-type SL communication, a UE may performone-to-one communication with respect to another UE. In case of thegroupcast-type SL transmission, the UE may perform SL communication withrespect to one or more UEs in a group to which the UE belongs. Invarious embodiments of the present disclosure, SL groupcastcommunication may be replaced with SL multicast communication, SLone-to-many communication, or the like.

Hereinafter, sidelink (SL) congestion control will be described.

If a UE autonomously determines an SL transmission resource, the UE alsoautonomously determines a size and frequency of use for a resource usedby the UE. Of course, due to a constraint from a network or the like, itmay be restricted to use a resource size or frequency of use, which isgreater than or equal to a specific level. However, if all UEs use arelatively great amount of resources in a situation where many UEs areconcentrated in a specific region at a specific time, overallperformance may significantly deteriorate due to mutual interference.

Accordingly, the UE may need to observe a channel situation. If it isdetermined that an excessively great amount of resources are consumed,it is preferable that the UE autonomously decreases the use ofresources. In the present disclosure, this may be defined as congestioncontrol (CR). For example, the UE may determine whether energy measuredin a unit time/frequency resource is greater than or equal to a specificlevel, and may adjust an amount and frequency of use for itstransmission resource based on a ratio of the unit time/frequencyresource in which the energy greater than or equal to the specific levelis observed. In the present disclosure, the ratio of the time/frequencyresource in which the energy greater than or equal to the specific levelis observed may be defined as a channel busy ratio (CBR). The UE maymeasure the CBR for a channel/frequency. Additionally, the UE maytransmit the measured CBR to the network/BS.

FIG. 10 shows a resource unit for CBR measurement, based on anembodiment of the present disclosure. The embodiment of FIG. 10 may becombined with various embodiments of the present disclosure.

Referring to FIG. 10, CBR may denote the number of sub-channels in whicha measurement result value of a received signal strength indicator(RSSI) has a value greater than or equal to a pre-configured thresholdas a result of measuring the RSSI by a UE on a sub-channel basis for aspecific period (e.g., 100 ms). Alternatively, the CBR may denote aratio of sub-channels having a value greater than or equal to apre-configured threshold among sub-channels for a specific duration. Forexample, in the embodiment of FIG. 10, if it is assumed that a hatchedsub-channel is a sub-channel having a value greater than or equal to apre-configured threshold, the CBR may denote a ratio of the hatchedsub-channels for a period of 100 ms. Additionally, the CBR may bereported to the BS.

Further, congestion control considering a priority of traffic (e.g.packet) may be necessary. To this end, for example, the UE may measure achannel occupancy ratio (CR). Specifically, the UE may measure the CBR,and the UE may determine a maximum value CRlimitk of a channel occupancyratio k (CRk) that can be occupied by traffic corresponding to eachpriority (e.g., k) based on the CBR. For example, the UE may derive themaximum value CRlimitk of the channel occupancy ratio with respect to apriority of each traffic, based on a predetermined table of CBRmeasurement values. For example, in case of traffic having a relativelyhigh priority, the UE may derive a maximum value of a relatively greatchannel occupancy ratio. Thereafter, the UE may perform congestioncontrol by restricting a total sum of channel occupancy ratios oftraffic, of which a priority k is lower than i, to a value less than orequal to a specific value. Based on this method, the channel occupancyratio may be more strictly restricted for traffic having a relativelylow priority.

In addition thereto, the UE may perform SL congestion control by using amethod of adjusting a level of transmit power, dropping a packet,determining whether retransmission is to be performed, adjusting atransmission RB size (Modulation and Coding Scheme (MCS) coordination),or the like.

Hereinafter, a hybrid automatic repeat request (HARQ) procedure will bedescribed.

In case of SL unicast and groupcast, HARQ feedback and HARQ combining inthe physical layer may be supported. For example, when a receiving UEoperates in a resource allocation mode 1 or 2, the receiving UE mayreceive the PSSCH from a transmitting UE, and the receiving UE maytransmit HARQ feedback for the PSSCH to the transmitting UE by using asidelink feedback control information (SFCI) format through a physicalsidelink feedback channel (PSFCH).

For example, the SL HARQ feedback may be enabled for unicast. In thiscase, in a non-code block group (non-CBG) operation, if the receiving UEdecodes a PSCCH of which a target is the receiving UE and if thereceiving UE successfully decodes a transport block related to thePSCCH, the receiving UE may generate HARQ-ACK. In addition, thereceiving UE may transmit the HARQ-ACK to the transmitting UE.Otherwise, if the receiving UE cannot successfully decode the transportblock after decoding the PSCCH of which the target is the receiving UE,the receiving UE may generate the HARQ-NACK. In addition, the receivingUE may transmit HARQ-NACK to the transmitting UE.

For example, the SL HARQ feedback may be enabled for groupcast. Forexample, in the non-CBG operation, two HARQ feedback options may besupported for groupcast.

(1) Groupcast option 1: After the receiving UE decodes the PSCCH ofwhich the target is the receiving UE, if the receiving UE fails indecoding of a transport block related to the PSCCH, the receiving UE maytransmit HARQ-NACK to the transmitting UE through a PSFCH. Otherwise, ifthe receiving UE decodes the PSCCH of which the target is the receivingUE and if the receiving UE successfully decodes the transport blockrelated to the PSCCH, the receiving UE may not transmit the HARQ-ACK tothe transmitting UE.

(2) Groupcast option 2: After the receiving UE decodes the PSCCH ofwhich the target is the receiving UE, if the receiving UE fails indecoding of the transport block related to the PSCCH, the receiving UEmay transmit HARQ-NACK to the transmitting UE through the PSFCH. Inaddition, if the receiving UE decodes the PSCCH of which the target isthe receiving UE and if the receiving UE successfully decodes thetransport block related to the PSCCH, the receiving UE may transmit theHARQ-ACK to the transmitting UE through the PSFCH.

For example, if the groupcast option 1 is used in the SL HARQ feedback,all UEs performing groupcast communication may share a PSFCH resource.For example, UEs belonging to the same group may transmit HARQ feedbackby using the same PSFCH resource.

For example, if the groupcast option 2 is used in the SL HARQ feedback,each UE performing groupcast communication may use a different PSFCHresource for HARQ feedback transmission. For example, UEs belonging tothe same group may transmit HARQ feedback by using different PSFCHresources.

For example, when the SL HARQ feedback is enabled for groupcast, thereceiving UE may determine whether to transmit the HARQ feedback to thetransmitting UE based on a transmission-reception (TX-RX) distanceand/or Reference Signal Received Power (RSRP).

For example, in the groupcast option 1, in case of the TX-RXdistance-based HARQ feedback, if the TX-RX distance is less than orequal to a communication range requirement, the receiving UE maytransmit HARQ feedback for the PSSCH to the transmitting UE. Otherwise,if the TX-RX distance is greater than the communication rangerequirement, the receiving UE may not transmit the HARQ feedback for thePSSCH to the transmitting UE. For example, the transmitting UE mayinform the receiving UE of a location of the transmitting UE through SCIrelated to the PSSCH. For example, the SCI related to the PSSCH may besecond SCI. For example, the receiving UE may estimate or obtain theTX-RX distance based on a location of the receiving UE and the locationof the transmitting UE. For example, the receiving UE may decode the SCIrelated to the PSSCH and thus may know the communication rangerequirement used in the PSSCH.

For example, in case of the resource allocation mode 1, a time (offset)between the PSFCH and the PSSCH may be configured or pre-configured. Incase of unicast and groupcast, if retransmission is necessary on SL,this may be indicated to a BS by an in-coverage UE which uses the PUCCH.The transmitting UE may transmit an indication to a serving BS of thetransmitting UE in a form of scheduling request (SR)/buffer statusreport (BSR), not a form of HARQ ACK/NACK. In addition, even if the BSdoes not receive the indication, the BS may schedule an SLretransmission resource to the UE. For example, in case of the resourceallocation mode 2, a time (offset) between the PSFCH and the PSSCH maybe configured or pre-configured.

For example, from a perspective of UE transmission in a carrier, TDMbetween the PSCCH/PSSCH and the PSFCH may be allowed for a PSFCH formatfor SL in a slot. For example, a sequence-based PSFCH format having asingle symbol may be supported. Herein, the single symbol may not an AGCduration. For example, the sequence-based PSFCH format may be applied tounicast and groupcast.

For example, in a slot related to a resource pool, a PSFCH resource maybe configured periodically as N slot durations, or may bepre-configured. For example, N may be configured as one or more valuesgreater than or equal to 1. For example, N may be 1, 2, or 4. Forexample, HARQ feedback for transmission in a specific resource pool maybe transmitted only through a PSFCH on the specific resource pool.

For example, if the transmitting UE transmits the PSSCH to the receivingUE across a slot #X to a slot #N, the receiving UE may transmit HARQfeedback for the PSSCH to the transmitting UE in a slot #(N+A). Forexample, the slot #(N+A) may include a PSFCH resource. Herein, forexample, A may be a smallest integer greater than or equal to K. Forexample, K may be the number of logical slots. In this case, K may bethe number of slots in a resource pool. Alternatively, for example, Kmay be the number of physical slots. In this case, K may be the numberof slots inside or outside the resource pool.

For example, if the receiving UE transmits HARQ feedback on a PSFCHresource in response to one PSSCH transmitted by the transmitting UE tothe receiving UE, the receiving UE may determine a frequency domainand/or code domain of the PSFCH resource based on an implicit mechanismin a configured resource pool. For example, the receiving UE maydetermine the frequency domain and/or code domain of the PSFCH resource,based on at least one of a slot index related to PSCCH/PSSCH/PSFCH, asub-channel related to PSCCH/PSSCH, and/or an identifier for identifyingeach receiving UE in a group for HARQ feedback based on the groupcastoption 2. Additionally/alternatively, for example, the receiving UE maydetermine the frequency domain and/or code domain of the PSFCH resource,based on at least one of SL RSRP, SINR, L1 source ID, and/or locationinformation.

For example, if HARQ feedback transmission through the PSFCH of the UEand HARQ feedback reception through the PSFCH overlap, the UE may selectany one of HARQ feedback transmission through the PSFCH and HARQfeedback reception through the PSFCH based on a priority rule. Forexample, the priority rule may be based on at least priority indicationof the related PSCCH/PSSCH.

For example, if HARQ feedback transmission of a UE through a PSFCH for aplurality of UEs overlaps, the UE may select specific HARQ feedbacktransmission based on the priority rule. For example, the priority rulemay be based on at least priority indication of the related PSCCH/PSSCH.

Meanwhile, in the present disclosure, a transmitting UE (i.e., TX UE)may be a UE which transmits data to a (target) receiving UE (i.e., RXUE). For example, the TX UE may be a UE which performs PSCCHtransmission and/or PSSCH transmission. For example, the TX UE may be aUE which transmits SL CSI-RS(s) and/or a SL CSI report request indicatorto the (target) RX UE. For example, the TX UE may be a UE whichtransmits (pre-defined) reference signal(s) (e.g., PSSCH demodulationreference signal(s) (DM-RS(s))) and/or a SL (L1) RSRP report requestindicator to be used for SL (L1) RSRP measurement to the (target) RXUE(s). For example, the TX UE may be a UE which transmits (control)channel(s) (e.g., PSCCH, PSSCH, etc.) and/or reference signal(s) (e.g.,DM-RS(s), CSI-RS(s), etc.) on the (control) channel(s) to be used for aSL radio link monitoring (RLM) operation and/or a SL radio link failure(RLF) operation of the (target) RX UE.

Meanwhile, in the present disclosure, a receiving UE (i.e., RX UE) maybe a UE which transmits SL HARQ feedback to a transmitting UE (i.e., TXUE) based on whether decoding of data received from the TX UE issuccessful and/or whether detection/decoding of a PSCCH (related toPSSCH scheduling) transmitted by the TX UE is successful. For example,the RX UE may be a UE which performs SL CSI transmission to the TX UEbased on SL CSI-RS(s) and/or a SL CSI report request indicator receivedfrom the TX UE. For example, the RX UE may be a UE which transmits, tothe TX UE, a SL (L1) RSRP measurement value measured based on(pre-defined) reference signal(s) and/or a SL (L1) RSRP report requestindicator received from the TX UE. For example, the RX UE may be a UEwhich transmits data of the RX UE to the TX UE. For example, the RX UEmay be a UE which performs a SL RLM operation and/or a SL RLF operationbased on a (pre-configured) (control) channel and/or reference signal(s)on the (control) channel received from the TX UE.

Meanwhile, in the present disclosure, a TX UE may transmit the entiretyor part of information described below to the RX UE through SCI(s).Herein, for example, the TX UE may transmit the entirety or part of theinformation described below to the RX UE through a first SCI and/or asecond SCI.

-   -   PSSCH (and/or PSCCH) related resource allocation information        (e.g., the location/number of time/frequency resources, resource        reservation information (e.g., period))    -   SL CSI report request indicator or SL (L1) RSRP (and/or SL (L1)        RSRQ and/or SL (L1) RSSI) report request indicator    -   SL CSI transmission indicator (or SL (L1) RSRP (and/or SL (L1)        RSRQ and/or SL (L1) RSSI) information transmission indicator))        (on a PSSCH)    -   Modulation and coding scheme (MCS) information    -   Transmit power information    -   L1 destination ID information and/or L1 source ID information    -   SL HARQ process ID information    -   New data indicator (NDI) information    -   Redundancy version (RV) information    -   (Transmission traffic/packet related) QoS information (e.g.,        priority information)    -   SL CSI-RS transmission indicator or information on the number of        antenna ports for (transmitted) SL CSI-RS    -   Location information of the TX UE or location (or distance        region) information of the target RX UE (for which SL HARQ        feedback is requested)    -   Reference signal (e.g., DM-RS, etc.) information related to        channel estimation and/or decoding of data to be transmitted        through a PSSCH. For example, the reference signal information        may be information related to a pattern of a (time-frequency)        mapping resource of DM-RS, rank information, antenna port index        information, information on the number of antenna ports, etc.

Meanwhile, in the present disclosure, for example, a PSCCH may bereplaced/substituted with at least one of a SCI, a first SCI (1st-stageSCI), and/or a second SCI (2nd-stage SCI), or vice versa. For example, aSCI may be replaced/substituted with at least one of a PSCCH, a firstSCI, and/or a second SCI, or vice versa. For example, a PSSCH may bereplaced/substituted with a second SCI and/or a PSCCH, or vice versa.

Meanwhile, in the present disclosure, for example, if SCI configurationfields are divided into two groups in consideration of a (relatively)high SCI payload size, an SCI including a first SCI configuration fieldgroup may be referred to as a first SCI or a 1^(st) SCI, and an SCIincluding a second SCI configuration field group may be referred to as asecond SCI or a 2^(nd) SCI. For example, the 1^(st) SCI and the 2^(nd)SCI may be transmitted through different channels. For example, thetransmitting UE may transmit the first SCI to the receiving UE throughthe PSCCH. For example, the second SCI may be transmitted to thereceiving UE through an (independent) PSCCH, or may be transmitted in apiggyback manner together with data through the PSSCH.

Meanwhile, in the present disclosure, for example,“configure/configured” or “define/defined” may refer to being(pre-)configured from a base station or a network. For example,“configure/configured” or “define/defined” may refer to being(pre-)configured for each resource pool from the base station or thenetwork. For example, the base station or the network may transmitinformation related to “configuration” or “definition” to the UE. Forexample, the base station or the network may transmit informationrelated to “configuration” or “definition” to the UE through pre-definedsignaling. For example, the pre-defined signaling may include at leastone of RRC signaling, MAC signaling, PHY signaling, and/or SIB.

Meanwhile, in the present disclosure, for example,“configure/configured” or “define/defined” may refer to being designatedor configured through pre-configured signaling between UEs. For example,information related to “configuration” or “definition” may betransmitted or received pre-configured signaling between UEs. Forexample, the pre-defined signaling may include at least one of RRCsignaling, MAC signaling, PHY signaling, and/or SIB.

Meanwhile, in the present disclosure, for example, RLF may bereplaced/substituted with out-of-synch (00S) and/or in-synch (IS), orvice versa.

Meanwhile, in the present disclosure, for example, a resource block (RB)may be replaced/substituted with a subcarrier, or vice versa. Forexample, a packet or a traffic may be replaced/substituted with atransport block (TB) or a medium access control protocol data unit (MACPDU) according to a transmission layer, or vice versa. For example, acode block group (CBG) may be replaced/substituted with a TB, or viceversa. For example, a source ID may be replaced/substituted with adestination ID, or vice versa. For example, an L1 ID may bereplaced/substituted with an L2 ID, or vice versa. For example, the L1ID may be an L1 source ID or an L1 destination ID. For example, the L2ID may be an L2 source ID or an L2 destination ID.

Meanwhile, in the present disclosure, for example, operation(s) of a TXUE to reserve/select/determine retransmission resource(s) may includeoperation(s) of the TX UE to reserve/select/determine potentialretransmission resource(s) in which actual use is determined based on SLHARQ feedback information received from RX UE(s).

Meanwhile, in the present disclosure, a sub-selection window may bereplaced/substituted with a selection window and/or a pre-configurednumber of resource sets within the selection window, or vice versa.

Meanwhile, in the present disclosure, SL MODE 1 may refer to a resourceallocation method or a communication method in which a base stationdirectly schedules SL transmission resource(s) for a TX UE throughpre-defined signaling (e.g., DCI or RRC message). For example, SL MODE 2may refer to a resource allocation method or a communication method inwhich a UE independently selects SL transmission resource(s) in aresource pool pre-configured or configured from a base station or anetwork. For example, a UE performing SL communication based on SL MODE1 may be referred to as a MODE 1 UE or MODE 1 TX UE, and a UE performingSL communication based on SL MODE 2 may be referred to as a MODE 2 UE orMODE 2 TX UE.

Meanwhile, in the present disclosure, for example, a dynamic grant (DG)may be replaced/substituted with a configured grant (CG) and/or asemi-persistent scheduling (SPS) grant, or vice versa. For example, theDG may be replaced/substituted with a combination of the CG and the SPSgrant, or vice versa. For example, the CG may include at least one of aconfigured grant (CG) type 1 and/or a configured grant (CG) type 2. Forexample, in the CG type 1, a grant may be provided by RRC signaling andmay be stored as a configured grant. For example, in the CG type 2, agrant may be provided by a PDCCH, and may be stored or deleted as aconfigured grant based on L1 signaling indicating activation ordeactivation of the grant. For example, in the CG type 1, a base stationmay allocate periodic resource(s) to a TX UE through an RRC message. Forexample, in the CG type 2, a base station may allocate periodicresource(s) to a TX UE through an RRC message, and the base station maydynamically activate or deactivate the periodic resource(s) through aDCI.

Meanwhile, in the present disclosure, a channel may bereplaced/substituted with a signal, or vice versa. For example,transmission/reception of a channel may include transmission/receptionof a signal. For example, transmission/reception of a signal may includetransmission/reception of a channel. For example, cast may bereplaced/substituted with at least one of unicast, groupcast, and/orbroadcast, or vice versa. For example, a cast type may bereplaced/substituted with at least one of unicast, groupcast, and/orbroadcast, or vice versa. For example, the cast or the cast type mayinclude unicast, groupcast and/or broadcast.

Meanwhile, in the present disclosure, a resource may bereplaced/substituted with a slot or a symbol, or vice versa. Forexample, the resource may include a slot and/or a symbol.

Meanwhile, in the present disclosure, a priority may bereplaced/substituted with at least one of logical channel prioritization(LCP), latency, reliability, minimum required communication range, proseper-packet priority (PPPP), sidelink radio bearer (SLRB), a QoS profile,a QoS parameter, and/or requirement, or vice versa.

Meanwhile, in the present disclosure, for example, for convenience ofdescription, a (physical) channel used when a RX UE transmits at leastone of the following information to a TX UE may be referred to as aPSFCH.

-   -   SL HARQ feedback, SL CSI, SL (L1) RSRP

Meanwhile, in the present disclosure, a high priority may mean a smallpriority value, and a low priority may mean a large priority value. Forexample, Table 5 shows an example of priorities.

service or logical channel priority value service A or logical channel A1 service B or logical channel B 2 service C or logical channel C 3

Referring to Table 5, for example, service A or logical channel Arelated to the smallest priority value may have the highest priority.For example, service C or logical channel C related to the largestpriority value may have the lowest priority.

Hereinafter, UE procedure for determining the subset of resources to bereported to higher layers in PSSCH resource selection in sidelinkresource allocation mode 2 will be described.

In resource allocation mode 2, the higher layer can request the UE todetermine a subset of resources from which the higher layer will selectresources for PSSCH/PSCCH transmission. To trigger this procedure, inslot n, the higher layer provides the following parameters for thisPSSCH/PSCCH transmission:

-   -   the resource pool from which the resources are to be reported;    -   L1 priority, prio_(TX);    -   the remaining packet delay budget;    -   the number of sub-channels to be used for the PSSCH/PSCCH        transmission in a slot, L_(subCH);    -   optionally, the resource reservation interval, P_(rsvp_TX), in        units of msec.    -   if the higher layer requests the UE to determine a subset of        resources from which the higher layer will select resources for        PSSCH/PSCCH transmission as part of re-evaluation or pre-emption        procedure, the higher layer provides a set of resources (r₀, r₁,        r₂, . . . ) which may be subject to re-evaluation and a set of        resources (r₀′, r₁′, r₂′, . . . ) which may be subject to        pre-emption.    -   it is up to UE implementation to determine the subset of        resources as requested by higher layers before or after the slot        r_(i)″-T₃, where r_(i)″ is the slot with the smallest slot index        among (r₀, r₁, r₂, . . . ) and (r₀′, r₁′, r₂′, . . . ), and T₃        is equal to T_(proc,1) ^(SL), where T_(proc,1) ^(SL) is the        number of slots determined based on the SCS configuration of the        SL BWP.

The following higher layer parameters affect this procedure:

-   -   sl-SelectionWindowList: internal parameter T_(2min) is set to        the corresponding value from higher layer parameter        sl-SelectionWindowList for the given value of prio_(TX).    -   sl-Thres-RSRP-List: this higher layer parameter provides an RSRP        threshold for each combination (p_(i), p_(j)), where p_(i) is        the value of the priority field in a received SCI format 1-A and        p_(j) is the priority of the transmission of the UE selecting        resources; for a given invocation of this procedure,        p_(j)=prio_(TX).    -   sl-RS-ForSensing selects if the UE uses the PSSCH-RSRP or        PSCCH-RSRP measurement.    -   sl-ResourceReservePeriodList    -   sl-SensingWindow: internal parameter T₀ is defined as the number        of slots corresponding to sl-SensingWindow msec    -   sl-TxPercentageList: internal parameter X for a given prio_(TX)        is defined as sl-TxPercentageList (prio_(TX)) converted from        percentage to ratio    -   sl-PreemptionEnable: if sl-PreemptionEnable is provided, and if        it is not equal to ‘enabled’, internal parameter prio_(pre) is        set to the higher layer provided parameter sl-PreemptionEnable

The resource reservation interval, P_(rsvp_TX), if provided, isconverted from units of msec to units of logical slots, resulting inP′_(rsvp_TX).

Notation:

(t′₀ ^(SL), t′₁ ^(SL), t′₂ ^(SL), . . . ) denotes the set of slots whichbelongs to the sidelink resource pool. For example, the UE may select aset of candidate resources (S_(A)) based on Table 6. For example, ifresource (re)selection is triggered, the UE may select a set ofcandidate resources (S_(A)) based on Table 6. For example, ifre-evaluation or pre-emption is triggered, the UE may select a set ofcandidate resources (S_(A)) based on Table 6.

TABLE 6 The following steps are used: 1) A candidate single-slotresource for transmission R_(x,y) is defined as a set of L_(subCH)contiguous sub- channels with sub-channel x + j in slot t′_(y) ^(SL)where j = 0, . . . , L_(subCH) − 1. The UE shall assume that any set ofL_(subCH) contiguous sub-channels included in the corresponding resourcepool within the time interval [n + T₁, n + T₂] correspond to onecandidate single-slot resource, where selection of T₁ is up to UEimplementation under 0 ≤ T₁ ≤ T_(proc,1) ^(SL) , where T_(proc,1) ^(SL)is defined in slots in Table 8.1.4-2 where μ_(S) _(L) is the SCSconfiguration of the SL BWP; if T_(2min) is shorter than the remainingpacket delay budget (in slots) then T₂ is up to UE implementationsubject to T_(2min) ≤ T₂ ≤ remaining packet delay budget (in slots);otherwise T₂ is set to the remaining packet delay budget (in slots). Thetotal number of candidate single-slot resources is denoted by M_(total).2) The sensing window is defined by the range of slots [n − T₀, n −T_(proc,0) ^(SL)) where: T₀ is defined above and T_(proc,0) ^(SL) isdefined in slots in Table 8.1.4-1 where μ_(SL) is the SCS configurationof the SL BWP. The UE shall monitor slots which belongs to a sidelinkresource pool within the sensing window except for those in which itsown transmissions occur. The UE shall perform the behaviour in thefollowing steps based on PSCCH decoded and RSRP measured in these slots.3) The internal parameter Th(p_(i), p_(j)) is set to the correspondingvalue of RSRP threshold indicated by the i-th field insl-Thres-RSRP-List, where i = p_(i) + (p_(j) − 1) * B. 4) The set S_(A)is initialized to the set, of all the candidate single-slot resources.5) The UE shall exclude any candidate single-slot resource R_(x,y) fromthe set S_(A) if it meets all the following coaditions: the UE has notmonitored slot t′

^(SL) in Step 2. for any periodicity value allowed by the higher layerparameter sl-ResourceReservePeriodList and a hypothetical SCI format 1-Areceived in slot t′_(m) ^(SL) with ′Resource reservation period′ fieldset to. that periodicity value and indicating all subchannels of theresource pool in this slot. condition c in step 6 would be met. 5a) Ifthe number of candidate single-slot resources R_(x,y) remaining in theset S_(A) is smaller than X - M_(total). the set S_(A) is initialized tothe set of all the candidate single-slot resources as in step 4. 6) TheUE shall exclude any candidate single-slot resource R_(x,y) from the setS_(A) if it meets all the following conditions: a) the UE receives anSCI format 1-A in slot t′_(m) ^(SL) , and ′Resource reservation period′field, if present. and ′Priority′ field in the received SCI format I-Aindicate the values P_(rsvp,RK) and prio_(RX), respectively, b) the RSRPmeasurement performed, for the received SCI format 1-A, is higher thanTh(prio_(RX), prio_(TX)); c) the SCI format received in slot t′_(m)^(SL) or the same SCI format which, if and only if the ′Resourcereservation period field is present in the received SCI format 1-A, isassumed to be received in slot(s) t′_(m+q×Prsvp...RX) 

 determines the set of resource blocks and slots which overlaps withR_(x,y+ )

_(×P )

_(′) for q = 1.2, . . . , Q and J = 0, 1, . . . , C 

 −1. Here. P_(rsvp)_RX^(′) is P_(rsvp)_RX, converted to units of logicalslots,$Q = \left| \frac{T_{5{cal}}}{\text{?}} \middle| {{{if}\mspace{14mu} P_{{{rsvp}...}{RX}}} < {T_{scal}\mspace{14mu}{and}\mspace{14mu}{n'}\;{\cdots m}} \leqq {{P_{{{rsvp}...}{RX}}'}.\mspace{14mu}{where}}} \right.$t′_(n′) ^(SL) = n if slot a belongs to the set (t′₀ ^(SL), t′₁ ^(SL), .. . , t′_(T′max−1) ^(SL)), otherwise slot t_(n′) ^(SL) is the first slotafter slot n belonging to the set (t′₀ ^(SL), t′₁ ^(SL), . . . ,t′_(T′max−1) ^(SL)); otherwise Q = 1. T 

 is set to selection window size T₂ converted to units of msec. 7) Ifthe number of candidate single-slot resources remaining in the set S_(A)is smaller than X · M_(total), then Th(p_(i), p_(j)) is increased by 3dB for each priority value Th(p_(i), p_(j)) and the procedure continueswith step 4. The UE shall report set S_(A) , to higher layers. If aresource r_(i) from the set (r₀, r₁, r₂, . . . ) is not a member ofS_(A), then the UE shall report re-evaluation of the resource r_(i) tohigher layers. If a resource r_(i)′ from the set (r₀′, r₁′, r₂′, . . . )meets the conditions below then the UE shall report pre-emption of theresource r_(i)′ to higher layers r_(i)′, is not a member of S_(A), andr_(i) ′ meets e conditions for exclusion in step 6, with Th(prio_(Rx),prio_(TX)) set to the final threshold after executing steps 1)-7), i.e.including all necessary increments for reaching X · M_(total), and theassociated priority prio_(RX), satisfies one of the followingconditions: sl-PreemptionEnable is provided and is equal to ′enabled′and prio_(TX) > prio_(RX) sl-PreemptionEnable is provided and is notequal to ′enabled′, and prio_(RX) < prio_(pre) and prio_(TX) > prio_(RX)

indicates data missing or illegible when filed

Meanwhile, for power saving of the UE, partial sensing may be supported.For example, partial sensing may be periodic-based partial sensing(PBPS) or contiguous partial sensing (CPS).

Meanwhile, there may be a case in which the P-UE performing partialsensing is not guaranteed the minimum number of slots required forsensing. Specifically, for example, the P-UE shall determine the endtime of the selection window in consideration of the packet delay budget(PDB), and the P-UE shall select Y candidate slots more than a minimumnumber within the selection window. In this case, if the PDB is tight orthe number of Y candidate slots is large, the P-UE may not be guaranteedthe minimum number of slots required for sensing. Therefore, when theP-UE is not guaranteed the minimum number of slots required for sensing,a method for resource selection of the P-UE needs to be defined.

For example, the UE (P-UE) performing a power saving operation (and/orSL DRX operation) may be configured to perform at least one ofre-evaluation procedure, pre-emption procedure, sensing operation,partial sensing operation and/or P-UE related mode 1/2 (resourceallocation/selection) operation, according to the following (some)rules. Here, for example, the following (some) rules may be configuredto be (limitedly) applied only when a periodic resource reservationoperation is permitted/configured on the resource pool. For example, thefollowing (some) rules may be configured to be (limitedly) applied onlywhen an aperiodic resource reservation operation is allowed/configuredon the resource pool. For example, the following (some) rules may beconfigured to be (limitedly) applied only when the periodic resourcereservation operation is not allowed/configured on the resource pool.For example, the following (some) rules may be configured to be(limitedly) applied only when the aperiodic resource reservationoperation is not allowed/configured on the resource pool. For example,the following (some) rules may be configured to be (limitedly) appliedonly when a (LCH or service-related) packet having a priority higherthan or equal to a pre-configured threshold level is transmitted. Forexample, the following (some) rules may be configured to be (limitedly)applied only when a (LCH or service-related) packet having a priorityless than or equal to a pre-configured threshold level is transmitted.For example, the following (some) rules may be configured to be(limitedly) applied only when packets related to QoS requirements (forexample, latency, reliability, minimum communication range) higher thanor equal to a pre-configured threshold are transmitted. For example, thefollowing (some) rules may be configured to be (limitedly) applied onlywhen packets related to QoS requirements (for example, latency,reliability, minimum communication range) below than or equal to apre-configured threshold are transmitted. For example, the following(some) rules may be configured to be (limitedly) applied only when acongestion level (for example, CBR) in the resource pool is higher thana pre-configured threshold. For example, the following (some) rules maybe configured to be (limitedly) applied only when a congestion level(for example, CBR) in the resource pool is lower than a pre-configuredthreshold.

According to an embodiment of the present disclosure, when the P-UEperforms a re-evaluation operation on a selection resource (before beingsignaled by SCI (determined internally by the terminal)) and/or apreemption check operation on a selection/reservation resource (signaledby SCI), the P-UE may be configured to determine a candidate(transmission) resource (set) in which re-evaluation-based reselectionfor a selection resource and/or preemption-based reselection for aselection/reservation resource can be performed, by using a sensingresult required to perform a re-evaluation operation and/or a sensingresult required to perform a preemption check operation (for example,ST_SENRST) and a result of partial sensing (for example, PT_SENRST)performed within a sensing window of a pre-configured length/size (forexample, LT_SENWIN) ((before transmission resource (re)selection istriggered and/or before data (to be transmitted) on the buffer (and/orLCH) is available)), together. For example, when the P-UE performs are-evaluation operation for a selection resource (before signaled by SCI(terminal internally determined)) and/or a preemption check operationfor a selection/reservation resource (signaled by SCI), the P-UE may beconfigured to determine, by using both ST_SENRST and PT_SENRST, whetherthe re-evaluation-based reselection for selection resources and/or thepreemption-based reselection for selection/reservation resources isrequired.

For example, when using the PT_SENRST result, the P-UE may assume thatthe corresponding (PSCCH/PSSCH) transmission is performed even on a timepoint (for example, slot #(N+P_VAL)) separated by one resourcereservation period (for example, P_VAL) from the time ofreceiving/decoding the related SCI (for example, slot #N). For example,when using the PT_SENRST result, the P-UE may assume that thecorresponding (PSCCH/PSSCH) transmission is performed even on a timepoint of P_VAL-based pre-configured numbers (for example, K_VAL) (forexample, slot #(N+P_VAL), slot #(N+P_VAL*2), . . . , slot#(N+P_VAL*(K_VAL−2)), slot #(N+P_VAL*(K_VAL−1))) from the time ofreceiving/decoding the related SCI (for example, slot #N). For example,when using the PT_SENRST result, the P-UE may assume that thecorresponding (PSCCH/PSSCH) transmission is performed even on a timepoint of P_VAL-based infinite numbers from the time ofreceiving/decoding the related SCI (for example, slot #N). For example,when using the PT_SENRST result, the P-UE may assume that thecorresponding (PSCCH/PSSCH) transmission is performed even on a timepoint of (future) time signaled by the (corresponding) SCI from the timeof receiving/decoding the related SCI (for example, slot #N). Based onthe above assumptions, the P-UE may be configured to determine acandidate (transmission) resource (set) in which re-evaluation-basedreselection for a selection resource and/or preemption-based reselectionfor a selection/reservation resource can be performed. Based on theabove-mentioned assumption, the P-UE may be configured to determinewhether the re-evaluation-based reselection for the selection resourceand/or the preemption-based reselection for the selection/reservationresource is required.

For example, the P-UE may be configured to perform sensing required toperform a re-evaluation operation and/or sensing required to perform apreemption check operation (for example, ST_SENOPT), within a (time)window (consisting of consecutive slots) of (independently)pre-configured length/size, (before signaled by SCI (determinedinternally by the terminal)) prior to selection resource and/orselection/reservation resource (signaled by SCI). For example, the P-UEmay be configured to perform ST_SENOPT, within a (time) window(consisting of consecutive slots) of (independently) pre-configuredlength/size, (before signaled by SCI (terminal internally determined))prior to a pre-configured offset value from a selection resource and/orselection/reservation resource (signaled by SCI). For example, the P-UEmay be configured to perform ST_SENOPT in a (pre)configured pattern formwithin a (time) window of a pre-configured length/size. For example, theP-UE may be configured to perform ST_SENOPT in a (pre)configured patternform, within a (time) window of a pre-configured length/size, (beforesignaled by SCI (determined internally in the terminal)) prior toselection resource and/or selection/reservation resource (signaled bySCI). For example, the P-UE may be configured to perform ST_SENOPT in a(pre)configured pattern form, within a (time) window of a pre-configuredlength/size, (before signaled by SCI (terminal internally determined))prior to a pre-configured offset value from a selection resource and/orselection/reservation resource (signaled by SCI). Here, for example, the(maximum or minimum or average) length/size of the (time) window inwhich ST_SENOPT is performed may be configured to be relatively shorterthan the (maximum or minimum or average) LT_SENWIN value related topartial sensing. For example, the (maximum or minimum or average)length/size of the (time) window in which ST_SENOPT is performed may beconfigured relatively longer than the (maximum or minimum or average)LT_SENWIN value related to partial sensing.

For example, in the case of performing ST_SENOPT, the P-UE may not beable to perform sensing on the relevant sensing request time (forexample, slot #M) (due to ((NR or LTE) SL and/or UL) transmitoperation). In this case, the P-UE may assume that PSCCH/PSSCHtransmission by another UE is performed based on the (all or somepre-configured) candidate resource reservation period values(exceptionally) allowed in the resource pool on slot #M. For example,when performing reselection based on reevaluation and/or reselectionbased on preemption, the (all) resources (in the selection window) onthe slot in which it is present may be in the form of excluded (and/ornon-selectable). And, the P-UE may be configured to determine acandidate (transmission) resource (set) in which re-evaluation-basedreselection and/or preemption-based reselection can be performed. Here,for example, such an operation/rule may be configured not to be(exceptionally) applied when determining a selectable candidate(transmission) resource (set) based on partial sensing.

According to an embodiment of the present disclosure, the P-UE mayperform a sensing operation (after) from a time when resource selectionis triggered (and/or when SL data (to be transmitted) is available onthe LCH (and/or (L2) buffer)) (for example, slot #N). For example, theP-UE may be configured to not perform a sensing operation in excess of apre-configured maximum sensing length. For example, the P-UE may beconfigured to (essentially) perform a sensing operation of apre-configured minimum sensing length. For example, the P-UE may beconfigured to perform a sensing operation of a pre-configured minimumsensing length even by shifting the start position of the selectionwindow. In the above case, after completing transmission resourceselection and/or transmission information processing (for example, slot#K (for example, K>N)), if the time before the pre-configured sensinglength (for example, slot #X), from the time before the pre-configuredoffset value from the (first) selected transmission resource (forexample, slot #(Y−OFFVAL1−OFFVAL2), is later (in time) than slot #(K+1)(and/or slot #(N+OFFVAL2+1)), the P-UE may be configured not to performa sensing operation during a time period from slot #(K+1) (and/or slot#(N+OFFVAL2+1)) to slot #(X−1) (for example, OFFVAL1 is the (minimum)time required for processing the sensing measurement/result value, andOFFVAL2 is the (minimum) time required for resource selection based onthe sensing information and/or processing for transmissioninformation)). Here, for example, the time interval in which the sensingoperation related to re-evaluation and/or preemption for the selectedtransmission resource on slot #Y is performed (additionally) may be fromslot #X to slot #(Y−OFFVAL1−OFFVAL2). In addition, for example, asensing result obtained during a time period from slot #N to slot #K(and/or slot #(N+OFFVAL2)) may be interpreted as being used for theselection of a transmission resource on slot #Y. For example, forre-evaluation and/or preemption check for the selected transmissionresource on slot #Y, it can be interpreted that the sensing resultobtained during the time period from slot #X to slot #(Y−OFFVAL1−OFFVAL2) and the sensing result obtained during the timeperiod from slot #N to slot #K (and/or slot #(N+OFFVAL2)) are usedtogether. Here, for example, when the above rule is applied, the timeinterval from slot #N to slot #K (and/or slot #(N+OFFVAL2)) may beinterpreted as the (minimum) length/size in which the sensing operationmust be performed.

For example, the P-UE may perform a sensing operation from (after) thetime when resource selection is triggered (for example, slot #N) (and/orwhen SL data (to be transmitted) on the LCH (and/or (L2) buffer) isavailable), the P-UE may be configured to perform the sensing operationonly a time before the pre-configured offset value from the lastselected transmission resource (for example, slot #(Y−OFFVAL1−OFFVAL2)).Here, for example, such a sensing result value may be interpreted asbeing used for (initial) transmission resource selection. For example,such a sensing result value may be interpreted as being used forre-evaluation and/or preemption check for the selected transmissionresource.

For example, the P-UE may be configured to perform a sensing operationonly from the time when the transmission resource selection is completed(for example, slot #(K+1)) to the time before the pre-configured offsetvalue from the last selected transmission resource (for example, slot#(Y−OFFVAL1−OFFVAL2)), after the time when the resource selection istriggered (for example, slot #N) (and/or when SL data (to betransmitted) on the LCH (and/or (L2) buffer) is available). Here, forexample, such a sensing result value may be interpreted as being usedfor re-evaluation and/or preemption check for the selected transmissionresource. In addition, for example, the (initial) selected transmissionresource may be interpreted as determined through random resourceselection.

For example, the P-UE may perform a sensing operation after a time pointat which transmission resource selection is completed (for example, slot#(K+1)), after a time point at which resource selection is triggered(for example, slot #N) (and/or when SL data (to be transmitted) on theLCH (and/or (L2) buffer) is available) (for example, the P-UE may beconfigured to not perform a sensing operation in excess of apre-configured maximum sensing length, and/or the P-UE may be configuredto (have to) perform a sensing operation of a pre-configured minimumsensing length (even by shifting the starting position of the selectionwindow)). In this case, if the time before the pre-configured sensinglength (for example, slot #X), from the time before the pre-configuredoffset value from the (first) selected transmission resource (forexample, slot #(Y−OFFVAL1−OFFVAL2)), is later (in time) than slot #(K+1)(and/or slot #(N+OFFVAL2+1)), the P-UE may be configured not to performa sensing operation during a time interval from slot #(K+1) (and/or slot#(N+OFFVAL2+1)) to slot #(X−1). Here, for example, the time intervalwhen the sensing operation related to re-evaluation and/or preemptionfor the selected transmission resource on slot #Y is (additionally)performed may be from slot #X to slot #(Y−OFFVAL1−OFFVAL2). In addition,for example, the (initial) selected transmission resource on slot #Y maybe interpreted as determined through random resource selection.

For example, the P-UE may perform a sensing operation of apre-configured length/size (for example, L_SENS) from (after) a timepoint at which resource selection is triggered (for example, slot #N)(and/or when SL data (to be transmitted) on the LCH (and/or (L2) buffer)is available). For example, the starting point of the selection windowmay not appear until the sensing operation of the correspondinglength/size is terminated (for example, slot #(N+L_SENS)), and/or thestarting point of the selection window may be shifted (on the timedomain). For example, after the P-UE performs the sensing operation ofL_SENS, P-UE may perform transmission resource selection based on thecorresponding sensing result information, within the selection window(for example, F_SWIN) from slot #(N+L_SENS+OFFVAL1+OFFVAL2) (forexample, OFFVAL1 is the (minimum) time required for processing ofsensing measurement/result value, and OFFVAL2 is the (minimum) timerequired for resource selection and/or processing of transmissioninformation based on the sensing information) to slot#(N+L_SENS+OFFVAL1+OFFVAL2+PDB_VAL) (for example, PDB_VAL means a valueless than or equal to the remaining latency budget of the (transmitted)packet). Here, for example, if the F_SWIN size/length is less than theinterval between slot #(N+L_SENS+OFFVAL1+OFFVAL2) and slot#(N+L_SENS+OFFVAL1+OFFVAL2+T_MIN) (for example, T_MIN is the (selectionwindow size/length) minimum value configured for each priority (relatedto transport packets)), and/or if the F_SWIN size/length is less thanthe pre-configured (minimum) threshold (per priority (of transportpacket) and/or CBR (in resource pool)), the P-UE may be configured notto apply the sensing operation rule of the L_SENS length/size from(after) slot #N (described above). Accordingly, the P-UE may perform asensing operation of a length/size less than the pre-configuredlength/size (for example, L_SENS). That is, the number of slots forsensing of the pre-configured length/size may not be guaranteed. In thiscase, for example, the P-UE may perform (initial) transmission resourceselection based on random resource selection, and/or may fall back to amethod for performing pre-configured sensing. Specifically, for example,according to a method for performing pre-configured sensing, the P-UEmay perform a sensing operation (of the pre-configured length and/orpattern) from a time point when resource selection is triggered (and/orwhen SL data (to be transmitted) on the LCH (and/or (L2) buffer) isavailable). Hereinafter, the above-described operation of the P-UE willbe described in detail with reference to FIGS. 11 and 12.

FIG. 11 illustrates a method for a UE to perform partial sensingaccording to an embodiment of the present disclosure. The embodiment ofFIG. 11 may be combined with various embodiments of the presentdisclosure.

Referring to (a) of FIG. 11, the UE may trigger resource (re)selectionat slot #N. In the embodiment of (a) of FIG. 11, it is assumed that theminimum number of candidate slots to be selected within the selectionwindow (that is, the selection window size) is 3. In this case, the UEmay select at least three candidate slots within the selection window.In the embodiment of (a) of FIG. 11, it is assumed that the UE selectsthree candidate slots within the selection window. In this case, the UEmay perform sensing after slot #N, and between the first of the threecandidate slots, the UE may select/determine a set of candidateresources in the candidate slot based on the sensing result. In theembodiment of (a) of FIG. 11, the sensing operation of thepre-configured length/size (for example, L_SENS) may be guaranteed.

On the other hand, referring to (b) of FIG. 11, the UE may triggerresource (re)selection in slot #N. In the embodiment of (b) of FIG. 11,it is assumed that the minimum number of candidate slots to be selectedin the selection window (that is, the selection window size) is 9. Inthis case, the UE may not be able to select 9 candidate slots within theselection window due to the size of the selection window limited by thePDB. In this case, according to an embodiment of the present disclosuredescribed above, a sensing operation execution rule of thepre-configured length/size (for example, L_SENS) may not be applied from(after) slot #N. Accordingly, the sensing operation of thepre-configured length/size (for example, L_SENS) may not be guaranteed.In this case, the UE may perform a sensing operation as in theembodiment of FIG. 12.

FIG. 12 illustrates a method for a UE to perform partial sensingaccording to an embodiment of the present disclosure. The embodiment ofFIG. 12 may be combined with various embodiments of the presentdisclosure.

Referring to FIG. 12, the UE may trigger resource (re)selection in slot#N. In the embodiment of FIG. 12, because of the minimum number ofcandidate slots that must be selected within the selection window (thatis, the selection window size), a sensing operation of thepre-configured length/size (for example, L_SENS) may not be guaranteed.In this case, the UE may perform random selection-based resourceselection or may continue to perform a sensing procedure based on thesensing result performed in a period smaller than the pre-configuredlength/size (for example, L_SENS).

Additionally, for example, the sensing operation (described above) ofL_SENS length/size from (after) slot #N may be limitedly applied only totransmit (service) packets having (remaining) latency budgetrequirements greater than or equal to (or less than or equal to) apre-configured threshold. For example, the sensing operation (describedabove) of L_SENS length/size from (after) slot #N may be limitedlyapplied only to transmit (service) packets having (remaining) latencybudget requirements below than or equal to a pre-configured threshold.

For example, the sensing operation (described above) of L_SENSlength/size from (after) slot #N may be limitedly applied only to thecase of transmitting (service) packets having a reliability requirementgreater than or equal to a pre-configured threshold. For example, thesensing operation (described above) of L_SENS length/size from (after)slot #N may be limitedly applied only to the case of transmitting(service) packets having a reliability requirement less than or equal toa pre-configured threshold. For example, the sensing operation(described above) of L_SENS length/size from (after) slot #N may belimitedly applied only to the case of transmitting the SL HARQ feedbackDISABLED packet (for example, a MAC PDU). For example, the sensingoperation (described above) of L_SENS length/size from (after) slot #Nmay be limitedly applied only to the case of transmitting the SL HARQfeedback ENABLED packet (for example, a MAC PDU). For example, thesensing operation (described above) of L_SENS length/size from (after)slot #N may be limitedly applied only when retransmission is performedless than or equal to a pre-configured threshold number. For example,the sensing operation (described above) of L_SENS length/size from(after) slot #N may be limitedly applied only when retransmission isperformed more than or equal to a pre-configured threshold number. Forexample, the sensing operation (described above) of L_SENS length/sizefrom (after) slot #N may be limitedly applied only to the case oftransmitting a packet having a priority less than or equal to apre-configured threshold level. For example, the sensing operation(described above) of L_SENS length/size from (after) slot #N may belimitedly applied only to the case of transmitting a packet having apriority higher than or equal to a pre-configured threshold level. Forexample, the sensing operation (described above) of L_SENS length/sizefrom (after) slot #N may be limitedly applied only when the interferencelevel (in the resource) is higher than or equal to a pre-configuredthreshold level. For example, the sensing operation (described above) ofL_SENS length/size from (after) slot #N may be limitedly applied onlywhen the interference level (in the resource) is less than or equal to apre-configured threshold level.

For example, the (minimum or maximum) L_SENS value may be configureddifferently (or independently) for each service type. For example, the(minimum or maximum) L_SENS value may be configured differently (orindependently) for each (LCH or service) priority. For example, the(minimum or maximum) L_SENS value may be configured differently (orindependently) for each QoS requirement (for example, latency,reliability, minimum communication range). For example, the (minimum ormaximum) L_SENS value may be configured differently (or independently)for each remaining delay budget/PDB value. For example, the (minimum ormaximum) L_SENS value may be configured differently (or independently)for each PQI parameter. For example, the (minimum or maximum) L_SENSvalue may be configured differently (or independently) for each HARQfeedback ENABLED LCH/MAC PDU (transmission). For example, the (minimumor maximum) L_SENS value may be configured differently (orindependently) for each HARQ feedback DISABLED LCH/MAC PDU(transmission). For example, the (minimum or maximum) L_SENS value maybe configured differently (or independently) for each CBR measurementvalue in the resource pool.

According to an embodiment of the present disclosure, when partial(and/or full) sensing operation (and/or periodic resource reservationoperation (and/or random resource selection operation)) isallowed/configured in the resource pool, only when the P-UE performs(actual) periodic resource reservation (and/or when the P-UE isinterested in a service for which (service) packets are generatedperiodically), the P-UE may be configured to (restrictively) perform apartial sensing operation. For example, only when the P-UE transmits apacket with a priority smaller than or equal to a pre-configuredthreshold level, the P-UE may be configured to (exceptionally)periodically reserve/maintain a random selection-based transmissionresource. For example, only when the P-UE transmits a packet with apriority higher than or equal to a pre-configured threshold level, theP-UE may be configured to (exceptionally) periodically reserve/maintaina random selection-based transmission resource. For example, only whenthe P-UE transmits (service) packets with (remaining) delay budgetrequirements greater than or equal to a pre-configured threshold, theP-UE may be configured to (exceptionally) periodically reserve/maintaina random selection-based transmission resource. For example, only whenthe P-UE transmits a (service) packet with a (remaining) delay budgetrequirement smaller than or equal to a pre-configured threshold, theP-UE may be configured to (exceptionally) periodically reserve/maintaina random selection-based transmission resource. For example, only whenthe P-UE transmits a (service) packet with a reliability requirementgreater than or equal to a pre-configured threshold, the P-UE may beconfigured to (exceptionally) periodically reserve/maintain a randomselection-based transmission resource. For example, only when the P-UEtransmits a (service) packet with a reliability requirement smaller thanor equal to a pre-configured threshold, the P-UE may be configured to(exceptionally) periodically reserve/maintain a random selection-basedtransmission resource. For example, only when the P-UE transmits an SLHARQ feedback DISABLED packet (for example, MAC PDU), the P-UE may beconfigured to (exceptionally) periodically reserve/maintain a randomselection-based transmission resource. For example, only when the P-UEtransmits an SL HARQ feedback ENABLED packet (for example, MAC PDU), theP-UE may be configured to (exceptionally) periodically reserve/maintaina random selection-based transmission resource. For example, only whenthe P-UE performs retransmissions less than or equal to a pre-configuredthreshold number, the P-UE may be configured to (exceptionally)periodically reserve/maintain a random selection-based transmissionresource. For example, only when the P-UE performs retransmission morethan or equal to a pre-configured threshold number of times, the P-UEmay be configured to (exceptionally) periodically reserve/maintain arandom selection-based transmission resource. For example, only when theinterference level (for example, CBR) value in the resource pool ishigher than or equal to a pre-configured threshold, the P-UE may beconfigured to (exceptionally) periodically reserve/maintain a randomselection-based transmission resource. For example, only when theinterference level (for example, CBR) value in the resource pool islower than or equal to a pre-configured threshold, the P-UE may beconfigured to periodically reserve/maintain (exceptionally) a randomselection-based transmission resource.

According to an embodiment of the present disclosure, based on mode 1operation, resource allocation and packet transmission of the UE(vehicle and/or power saving (and/or performing SL DRX operation)) maybe performed. In this case, when the UE transmits the PSCCH (and/orPSSCH) using the SL CG (Type 1 and/or Type 2) resource, the UE maydesignate the resource reservation period field value on the PSCCH (forexample, 1ST SCI) as the SL CG (type 1 and/or type 2) related resourcereservation period value (configured through RRC signaling (from thebase station)). On the other hand, when the UE retransmits the PSCCH(and/or PSSCH) using the (retransmission) resource allocated through theSL DG (for example, DCI), the UE may designate the resource reservationperiod field value on the PSCCH (for example, 1ST SCI) as apre-configured specific value (for example, 0). When the UE retransmitsthe PSCCH (and/or PSSCH) using the (retransmission) resource allocatedthrough the SL DG (for example, DCI), the UE may designate the resourcereservation period field value on the PSCCH (for example, 1ST SCI) asthe SL CG (type 1 and/or type 2) related resource reservation periodvalue (configured through RRC signaling (from the base station)). Here,for example, when retransmission for PSCCH (and/or PSSCH) is performedusing (retransmission) resources allocated through SL DG (DCI), if theUE designates the resource reservation period field value on the PSCCH(for example, 1ST SCI) as an SL CG (type 1 and/or type 2) relatedresource reservation period value (for example, CG_PVAL), the UE mayexpect/determine that the base station schedules/allocates the locationof different SL CG period related retransmission resources bymaintaining the time interval of CG_PVAL.

For example, when resource allocation and packet transmission of the UE(vehicle and/or power saving (and/or performing SL DRX operation)) areperformed based on mode 1 operation, the UE may expect/determine thatthe (time) interval (within a specific period) between the CG (Type 1and/or Type 2) (last) resource and the retransmission-related DG (first)resource does not exceed a pre-configured threshold (for example, 32slots). For example, when resource allocation and packet transmission ofthe UE (vehicle and/or power saving (and/or performing SL DRXoperation)) are performed based on mode 1 operation, the UE mayexpect/determine that the (time) interval between the DG (last) resource(where initial transmission and/or retransmission has been performed)and the retransmission-related DG (first) resource does not exceed apre-configured threshold (for example, 32 slots). In addition, forexample, the proposed rule can be limitedly applied only when the targetRX UE (and/or service type and/or LCH (SL data)) related to thetransport packet is a power saving UE and/or a UE performing SL DRXoperation. For example, the proposed rule can be limitedly applied onlywhen the transport packet-related priority (and/or (L2) destination(and/or source) ID (pair)) is a pre-configured value (related to a powersaving UE and/or a UE performing SL DRX operation). For example, theproposed rule may be limitedly applied only when a power saving UEand/or a UE performing SL DRX operation coexist on a (mode 1) resourcepool. For example, the proposed rule may be limitedly applied only whenresource selection based on random selection and/or partial sensing isallowed on the mode 1 resource pool. For example, the proposed rule maybe limitedly applied only when the mode 1 resource pool overlaps (partlyor all) with a resource pool for a power saving UE and/or a UEperforming SL DRX operation. For example, the proposed rule may belimitedly applied only when the mode 1 resource pool overlaps (partly orall) a resource pool in which the partial sensing and/or the resourceselection based on the random selection is allowed.

According to an embodiment of the present disclosure, the P-UE(performing the SL DRX operation) may expect/determine that (servicetype and/or (LCH or service) priority and/or QoS requirements and/or PQIparameters and/or (L2) destination (and/or source) ID (pair) specific)(UE common) SL DRX pattern and/or the parameter, configured by the basestation (for example, SIB, RRC) in the in-coverage state, is the same asthe (service type and/or (LCH or service) priority and/or QoSrequirements and/or PQI parameters and/or (L2) destination (and/orsource) ID (pair) specific) (UE common) SL DRX patterns and/or theparameters, pre-configured (by the network) in the out-of-coveragestate. For example, the P-UE (performing the SL DRX operation) mayexpect/determine that (service type and/or (LCH or service) priorityand/or QoS requirements and/or PQI parameters and/or (L2) destination(and/or source) ID (pair) specific) (UE common) the SL DRX patternsand/or parameters configured by the base station (for example, SIB, RRC)in an in-coverage state, are overlapped (some or all) with the (servicetype and/or (LCH or service) priority and/or QoS requirements and/or PQIparameters and/or (L2) destination (and/or source) ID (pair) specific)(UE common) SL DRX patterns and/or the parameters, pre-configured (bythe network) in the out-of-coverage state, in terms of wake-up timeand/or active time and/or on-duration. For example, the P-UE (performingthe SL DRX operation) may expect/determine that the (service type and/or(LCH or service) priority and/or QoS requirements and/or PQI parametersand/or (L2) destination (and/or source) ID (pair) specific) (UE common)SL DRX patterns and/or parameters configured from different basestations (for example, SIB, RRC) are the same. For example, the P-UE(performing the SL DRX operation) may expect/determine that the (servicetype and/or (LCH or service) priority and/or QoS requirements and/or PQIparameters and/or (L2) destination (and/or source) ID (pair) specific)(UE common) SL DRX patterns and/or parameters configured by differentbase stations (for example, SIB, RRC) are overlapped (some or all) witheach other, in terms of wake-up time and/or active time and/oron-duration.

According to an embodiment of the present disclosure, during SL DRXoperation, before on-duration and/or active time (appeared periodicallybased on the SL DRX cycle), PSCCH ONLY monitoring resource area (forexample, CTR_RSC) for acquiring sensing information (related/associatedwith PSSCH (and/or PSCCH) transmission within subsequent on-durationand/or active time) may be configured. Here, for example, when thecorresponding rule is applied, even if the P-UE generates a transportpacket (on (L2) buffer) after on-duration and/or active time start(and/or (transmitting) SL data available on LCH) (for example, slot #N),the P-UE may perform (related) transmission resource selection by usingsensing information acquired in CTR_RSC and sensing information acquiredin a time interval from a starting slot of on-duration and/or activetime to a time before a pre-configured offset from slot #N (for example,slot #(N−OFFVAL1) (for example, OFFVAL1 means (minimum) time requiredfor processing of sensing measurement/result value)) together. Here, forexample, the proposed rule may be limitedly applied only to the case oftransmitting a packet having a priority higher than a pre-configuredthreshold level. For example, the proposed rule may be limitedly appliedonly when a packet having a lower priority than a pre-configuredthreshold level is transmitted. For example, the proposed rule may belimitedly applied only when service-related communication having ahigher priority than a pre-configured threshold level is performed. Forexample, the proposed rule may be limitedly applied only whenservice-related communication having a lower priority than apre-configured threshold level is performed. For example, the proposedrule may be limitedly applied only when a packet having a (remaining)delay budget shorter than a pre-configured threshold is transmitted. Forexample, the proposed rule may be limitedly applied only when a packethaving a (remaining) delay budget longer than a pre-configured thresholdis transmitted. For example, the proposed rule may be limitedly appliedonly when service-related communication having a QoS requirement shorterthan a pre-configured threshold is performed. For example, the proposedrule may be limitedly applied only when service-related communicationhaving a QoS requirement longer than a pre-configured threshold isperformed. For example, the proposed rule may be limitedly applied onlywhen a packet having a reliability higher than a pre-configuredthreshold is transmitted. For example, the proposed rule may belimitedly applied only when a packet having a reliability lower than apre-configured threshold is transmitted. For example, the proposed rulemay be limitedly applied only when service-related communication havinga QoS requirement higher than a pre-configured threshold is performed.For example, the proposed rule may be limitedly applied only whenservice-related communication having a QoS requirement lower than apre-configured threshold is performed. For example, the proposed rulemay be limitedly applied only to the case of transmitting the SL HARQfeedback DISABLED LCH/MAC PDU. For example, the proposed rule may belimitedly applied only to the case of transmitting the SL HARQ feedbackENABLED LCH/MAC PDU. For example, the proposed rule may be limitedlyapplied only when the interference level (for example, CBR) in theresource pool is higher than a pre-configured threshold. For example,the proposed rule may be limitedly applied only when the interferencelevel (for example, CBR) in the resource pool is lower than apre-configured threshold.

According to an embodiment of the present disclosure, when the following(some) conditions are satisfied, the P-UE may be configured to performtransmission resource selection over an on-duration and/or an (inactivetime) domain other than the active time domain. For the convenience ofdescription, the on-duration and/or active time region may be referredto as ACT_RG, and other (inactive time) regions may be referred to asOFF_RG.

Ex) When the interference level (for example, CBR) on ACT_RG is higherthan the pre-configured threshold level

Ex) When the interference level (for example, CBR) on ACT_RG is lowerthan the pre-configured threshold level

Ex) When the interference level on OFF_RG is lower than thepre-configured threshold level

Ex) When the interference level on OFF_RG is higher than thepre-configured threshold level

Ex) When the (MAC PDU related) number of transmission resources is morethan the pre-configured threshold

Ex) When the (MAC PDU related) number of transmission resources is lessthan the pre-configured threshold

Ex) When transmitting HARQ feedback ENABLED LCH/MAC PDU

Ex) When transmitting HARQ feedback DISABLED LCH/MAC PDU

Ex) When transmitting an LCH/MAC PDU with a lower priority than apre-configured threshold level

Ex) When transmitting an LCH/MAC PDU with a higher priority than apre-configured threshold level

Ex) When transmitting an LCH/MAC PDU of a pre-configured service type

Ex) When transmitting an LCH/MAC PDU with a (remaining) delay budget(requirement) longer than a pre-configured threshold

Ex) When transmitting an LCH/MAC PDU with a (remaining) delay budget(requirement) shorter than a pre-configured threshold

Ex) When transmitting an LCH/MAC PDU with reliability (requirement)lower than the pre-configured threshold

Ex) When transmitting an LCH/MAC PDU with reliability (requirement)higher than the pre-configured threshold

Ex) When transmitting an LCH/MAC PDU with a pre-configured cast type(for example, unicast and/or groupcast and/or broadcast)

Here, for example, the ratio of the number of (MAC PDU related)transmission resources divided between ACT_RG and OFF_RG and/or the(minimum) number of transmission resources (that must be) included inthe ACT_RG region and/or the (maximum) number of transmission resources(that must be)included in the OFF_RG region and/or the (maximum) numberof transmission resources that can be included in the OFF_RG region maybe configured differently (or independently) for each (related) servicetype. For example, the ratio of the number of transmission resources(related to MAC PDU) divided between ACT_RG and OFF_RG and/or the(minimum) number of transmission resources (that must be) included inthe ACT_RG region and/or the (maximum) number of transmission resources(that must be) included in the OFF_RG region and/or the (maximum) numberof transmission resources that can be included in the OFF_RG region maybe configured differently (or independently) for each priority (LCH orservice). For example, the ratio of the number of (MAC PDU related)transmission resources divided between ACT_RG and OFF_RG and/or the(minimum) number of transmission resources (that must be) included inthe ACT_RG area and/or the (maximum) number of transmission resources(that must be)included in the OFF_RG area and/or the (maximum) number oftransmission resources that can be included in the OFF_RG region may beconfigured differently (or independently) for each QoS requirement (forexample, latency, reliability, minimum communication range). Forexample, the ratio of the number of (MAC PDU related) transmissionresources divided between ACT_RG and OFF_RG and/or the (minimum) numberof transmission resources (that must be) included in the ACT_RG areaand/or the (maximum) number of transmission resources (that must be)included in the OFF_RG area and/or the (maximum) number of transmissionresources that can be included in the OFF_RG region may be configureddifferently (or independently) for each PQI parameter. For example, theratio of the number of transmission resources (related to MAC PDU)divided between ACT_RG and OFF_RG and/or the (minimum) number oftransmission resources (that must be) included in the ACT_RG area and/orthe (maximum) number of transmission resources (that must be) includedin the OFF_RG region and/or the (maximum) number of transmissionresources that can be included in the OFF_RG region may be configureddifferently (or independently) according to the amount of the(remaining) delay budget of the transport packet. For example, the ratioof the number of transmission resources (related to MAC PDU) dividedbetween ACT_RG and OFF_RG and/or the (minimum) number of transmissionresources (that must be) included in the ACT_RG area and/or the(maximum) number of transmission resources (that must be) included inthe OFF_RG area and/or the (maximum) number of transmission resourcesthat can be included in the OFF_RG region may be configured differently(or independently) for each HARQ feedback ENABLED LCH/MAC PDU(transmission). For example, the ratio of the number of transmissionresources (related to MAC PDU) divided between ACT_RG and OFF_RG and/orthe (minimum) number and/or the number of transmission resources (thatmust be) included in the ACT_RG area and/or the (maximum) number oftransmission resources (that must be) included in the OFF_RG area and/orthe (maximum) number of transmission resources that can be included inthe OFF_RG region may be configured differently (or independently) foreach HARQ feedback DISABLED LCH/MAC PDU (transmission). For example, theratio of the number of transmission resources (related to MAC PDU)divided between ACT_RG and OFF_RG and/or the (minimum) number oftransmission resources (that must be) included in the ACT_RG area and/orthe (maximum) number of transmission resources (that must be) includedin the OFF_RG area and/or the (maximum) number of transmission resourcesthat can be included in the OFF_RG region may be configured differently(or independently) for each SL cast type (for example, unicast,groupcast, broadcast). For example, the ratio of the number oftransmission resources (related to MAC PDU) divided between ACT_RG andOFF_RG and/or the (minimum) number of transmission resources (that mustbe) included in the ACT_RG area and/or the (maximum) number oftransmission resources (that must be) included in the OFF_RG area and/orthe (maximum) number of transmission resources that can be included inthe OFF_RG region may be configured differently (or independently) foreach SL groupcast HARQ feedback option (for example, NACK ONLY feedback,ACK/NACK feedback, NACK ONLY feedback based on TX-RX distance). Forexample, the P-UE may be configured to include initial transmissionresources (related to a MAC PDU) in the ACT_RG region, and includeretransmission resources (related to a MAC PDU) in the OFF_RG region.

Meanwhile, it may be difficult for the P-UE to accurately predict whenthe actual data (on LCH and/or on its own (L2) buffer) (to betransmitted) is available (even for a service in which packets areperiodically generated (on the application layer)). For example, this isbecause the packet generation period can vary depending on several(environmental) factors. Therefore, it may be difficult for the P-UE toaccurately determine the (actually necessary) timing of a partialsensing operation (and/or additional sensing operation timing (and/oradditional sensing operation timing (in the form of a (pre-established)pattern (and/or consisting of consecutive slots)) of a pre-configuredlength (for example, STS_WIN) before slot N (and/or slot (N-OFFSET) (forexample, offset means the minimum time required to process the sensingresult))) in the form of a pre-configured pattern to perform only arelated sensing operation, within the (pre-configured length) sensingwindow, based on the time when the actual data (on the LCH and/or on its(L2) buffer) (to be transmitted) is available (and/or a time point atwhich resource (re)selection is triggered and/or a slot from which aselectable candidate transmission resource is derived within theselection window) (for example, slot N). In consideration of this, theP-UE may perform a partial sensing operation (and/or additional sensingoperation of a pre-configured length (in the form of a (pre-configured)pattern (and/or consisting of consecutive slots)) before slot N (and/orslot (N-OFFSET))) in the form of a pre-configured pattern, within asensing window (of a pre-configured length), based on the time when thedata (on LCH and/or on its own (L2) buffer) (to be transmitted) isavailable (and/or a time point at which resource (re)selection istriggered and/or a slot from which a selectable candidate transmissionresource is derived within the selection window) (for example, slot N′)predicted (implementational or virtually) by the P-UE. Here, forexample, when slot N is later than slot N′ (in the time domain), theP-UE may be configured to additionally perform a sensing operation (inthe form of a pre-configured length ((pre-configured) pattern (and/orconsisting of contiguous slots) (after STS_WIN (which has already beendone based on slot N′)). For example, when slot N is later than the slotN′ (in the time domain), the P-UE may be configured to additionallyperform a sensing operation until slot N (and/or slot (N-OFFSET)) (inthe form of a (pre-established) pattern (and/or consisting ofconsecutive slots)) (after STS_WIN (which has already been done based onslot N′)).

According to an embodiment of the present disclosure, the P-UE may beconfigured to perform (additional) sensing (for example, STS_SNS) of apre-configured length (for example, STS_LNG) (and/or pattern) afterand/or before a pre-configured time (for example, slot N). Here, forexample, the slot N may be configured as a time point that satisfies thefollowing (partial) conditions. In addition, a slot in which STS_SNS isperformed may be designated/defined as a continuous slot (in the timedomain).

Ex) When resource (re)selection is triggered

Ex) When data to be transmitted exists on the buffer (or LCH)

Ex) Start point related to the selection window

Ex) End point related to the selection window

Ex) Prior point related to the selection window

Ex) (in a pre-configured sequence number (for example, first or last))(individual) slot timing from which selectable transmission (time and/orfrequency) resources within the selection window are derived (whichsatisfies a pre-configured minimum number or more)

Ex) Transmission resource time of a pre-configured sequence number (forexample, first or last) selected/reserved within the selection window

For example, before the P-UE performs (additionally) STS_SNS of STS_LNG(before and/or after slot N), if the P-UE has (already) performedsensing for K slots (on the time domain where STS_SNS is performedand/or the time domain related to STS_LNG and/or the active time relatedto SL DRX and/or on-duration related to SL DRX) based on apre-configured type of sensing operation (for example, partial sensing),the P-UE may be configured to perform an STS_LNG-related (additional)sensing operation only for the remaining length and/or time domains (forexample, slots) except for K slots in STS_LNG. Here, for example, inthis case, the start (and/or pre-configured) time point related to theselection window (and/or a (individual) slot time point (of apre-configured sequence number (for example, first)) from which aselectable transmission (time and/or frequency) resource within theselection window is derived (which satisfies a pre-configured minimumnumber or more)) may be interpreted as being shifted (or trailing) bythe remaining length (and/or time domain) (and/or pre-configured offset)excluding K slots in STS_LNG. On the other hand, for example, before theP-UE performs (additionally) STS_SNS of STS_LNG (before and/or afterslot N), if the P-UE has not performed a sensing operation (for example,partial sensing) (in the time domain in which STS_SNS is performedand/or in the time domain related to STS_LNG and/or on the active timerelated to SL DRX and/or on-duration related to SL DRX), the P-UE may beconfigured to perform a (additional) sensing operation of the STS_LNGlength. Here, for example, in this case, the selection window-relatedstart (and/or pre-configured) time point (and/or a (individual) slottime point (of a pre-configured sequence number (for example, first))from which a selectable transmission (time and/or frequency) resourcewithin the selection window is derived (which satisfies a pre-configuredminimum number or more)) may be interpreted as being shifted (ortrailing) by the length (and/or time domain) (and/or pre-configuredoffset) of STS_LNG. For example, the proposed rule may be limitedlyapplied when the P-UE needs to perform STS_SNS of STS_LNG before (offsetpre-configured with reference from) the selection window-related start(and/or pre-configured) time point (and/or a (individual) slot timepoint (of a pre-configured sequence number (for example, first)) fromwhich a selectable transmission (time and/or frequency) resource withinthe selection window is derived (which satisfies a pre-configuredminimum number or more)). In addition, for example, if the P-UE cannotmonitor and/or sense some slots (for example, NON MSLT) due to itstransmission (for example, PSCCH/PSSCH TX, UL TX, LTE SL TX) and thelike in the STS_LNG related time domain, the P-UE may be configured toperform an additional sensing operation as much as NON MSLT (forexample, a type in which (additional) sensing operation for a timedomain having a length of STS_LNG is (always) guaranteed). Otherwise,for example, if the P-UE cannot monitor and/or sense some slots (forexample, NON MSLT) due to its transmission (for example, PSCCH/PSSCH TX,UL TX, LTE SL TX) and the like in the STS_LNG related time domain, theP-UE may be configured to perform a sensing operation only for theremaining time domains except for NON MSLT in STS_LNG. For example, ifNON MSLT exists, the P-UE may assume that transmission related to apre-configured period value (set) (among the values configured asselectable resource reservation cycle values within the resource pool)(and/or its own transmission reservation period value and/or selectablemaximum (and/or minimum and/or (weight) average) resource reservationperiod value within the resource pool) (for example, P_VAL) is(virtually) performed on NON MSLT (for example, slot K), the P-UE mayexclude candidate resources (for example, slots) overlapping therelevant slot (K+P_VAL) within the selection window, and/or the P-UE maybe configured not to apply the operation of excluding the NONMSLT-related transmission resource candidate (exceptionally) within theselection window. In addition, for example, when the P-UE selects a(individual) slot (for example, Y_SLOT) from which a selectabletransmission (time and/or frequency) resource within the selectionwindow is derived (which satisfies a pre-configured minimum number ormore), the P-UE may be configured to restrictively (or preferentially ormaximally) designate a slot in which STS_SNS of STS_LNG is performed (byincluding partial sensing and/or SL DRX related active time and/or SLDRX related on-duration, and the like). For example, when the P-UEselects a (individual) slot (for example, Y_SLOT) from which aselectable transmission (time and/or frequency) resource within theselection window is derived (which satisfies a pre-configured minimumnumber or more), the P-UE may be configured to restrictively (orpreferentially or maximally) designate a slot in which STS_SNS ofSTS_LNG is performed (by including partial sensing and/or SL DRX relatedactive time and/or SL DRX related on-duration, and the like). Here, forexample, when the corresponding rule is applied, it can be interpretedthat the Y_SLOT position is shifted (or followed) to a time point afterSTS_SNS of STS_LNG. In the present disclosure, for example, STS_LNG mayinclude (maximum of or minimum of) the SL DRX area (composed ofconsecutive slots) and/or the area in which a pre-configured type ofsensing (for example, partial sensing) is performed.

According to an embodiment of the present disclosure, if the following(some) conditions are satisfied, a UE performing SL communication may beconfigured to transmit (via PUCCH and/or PSFCH) ACK information (to abase station and/or a counterpart (peer/target) UE).

Ex) When the (L2) buffer (related to the linked SL process (ID)) isflushed

Ex) When the (some) events described below occur

Here, for example, the above situation may be a case in which the TX UEreceives ACK information (via PSFCH) from the RX UE. For example, theabove situation may be a case in which the RX UE transmits ACKinformation to the TX UE (after receiving/decoding the packetsuccessfully). For example, the above situation is that the RX UE sendsACK information (via PSFCH) to the TX UE, but due to a PSFCH (and/or SLHARQ feedback information) detection error (for example, a situation inwhich the TX UE misinterprets that the TX UE has received NACKinformation (and/or the TX UE misinterprets that the RX UE did notperform PSFCH transmission)), the RX UE receives a retransmission packet(related to the same SL HARQ (ID)) from the TX UE. For example, theabove situation may be a case in which the mode 1 TX UE determines thatthe (corresponding) packet-related PDB is exceeded (when performing apacket transmission operation based on the transmission resourceallocated from the base station). For example, the above situation maybe a case where it is determined that the mode 1 TX UE will not be ableto perform transmission in the (corresponding) packet-related PDB (whenperforming a packet transmission operation based on the transmissionresource allocated from the base station). For example, the abovesituation may be a case in which a pre-configured maximum number ofretransmissions (for each priority and/or mode 1 SL CG) is reached whenpacket transmission is performed. For example, the above situation maybe a case in which a pre-configured maximum number of retransmissions(for each priority and/or mode 1 SL CG) is exceeded when packettransmission is performed.

According to an embodiment of the present disclosure, when the UEperforms resource (re)selection, if available data (on LCH and/or (L2)buffer) has SL HARQ feedback DISABLED characteristic, if the related SLgrant is created on the resource pool in which the PSFCH resource isconfigured, the UE may perform the LCP operation related to thegeneration of a MAC PDU to be transmitted using the (corresponding) SLgrant-related resource. In this case, only when the time gap between thetwo selection/reservation resources satisfies the pre-configured minimumHARQ RTT, the UE may be allowed/configured to generate a MAC PDU havingthe SL HARQ feedback ENABLED characteristic (via LCP), the UE may beallowed/configured to transmit the MAC PDU through the corresponding (SLgrant-related) selection/reservation resource. For example, when thereare two selection/reservation resources that do not satisfy the minimumHARQ RTT configured in advance, the UE may be allowed/configured togenerate (via LCP) only a MAC PDU having the SL HARQ feedback DISABLEDcharacteristic, the UE may be allowed/configured to transmit the MAC PDUthrough the corresponding (SL grant-related) selection/reservationresource.

For example, whether to apply the above rule (and/or parameter valuesrelated to the proposed method/rule of the present disclosure) may bespecifically (or differently or independently) configured/allowed(and/or the above rules may be restrictively configured/allowed) for atleast one of the elements/parameters (or for at least, by one) ofservice type (and/or (LCH or service) priority and/or QoS requirements(for example, latency, reliability, minimum communication range) and/orPQI parameters) (and/or HARQ feedback ENABLED (and/or DISABLED) LCH/MACPDU (transmission), and/or CBR measurement value of the resource pool,and/or SL cast type (for example, unicast, groupcast, broadcast), and/orSL groupcast HARQ feedback option (for example, NACK ONLY feedback,ACK/NACK feedback, NACK ONLY feedback based on TX-RX distance), and/orSL mode 1 CG type (for example, SL CG type 1/2), and/or SL mode type(for example, mode 1/2), and/or resource pools, and/or whether theresource pool in which the PSFCH resource is configured, and/or whenperiodic resource reservation operation (and/or aperiodic resourcereservation operation) is allowed/configured (or not allowed/configured)on the resource pool, and/or when partial sensing operation (and/orrandom resource selection operation (and/or full sensing operation)) isallowed/configured (or not allowed/configured) on the resource pool,and/or source (L2) ID (and/or destination (L2) ID), and/or PC5 RRCconnection link, and/or SL Link, and/or connection state (with basestation) (for example, RRC CONNECTED state, IDLE state, INACTIVE state),and/or SL HARQ process (ID) and/or whether SL DRX operation (of TX UE orRX UE) is performed, and/or whether it is power saving (TX or RX) UE,and/or when (in a specific UE point of view) PSFCH TX and PSFCH RX(and/or a plurality of PSFCH TX (exceeds UE CAPABILITY)) are overlappedeach other (and/or PSFCH TX (and/or PSFCH RX) is omitted), and/or whenthe RX UE actually (successfully) receives the PSCCH (and/or PSSCH)(re)transmission from the TX UE, and/or a UE performing partial sensing(and/or (no sensing) random selection (and/or full sensing)) basedresource selection, and/or a UE performing a periodic (for example, aplurality of MAC PDUs) (and/or aperiodic (for example, single MAC PDU))resource reservation operation, and/or a UE performing periodic (and/oraperiodic) packet transmission, and/or when the sensing operation is notperformed before the resource (re)selection triggering time (and/orpresence of the data on the buffer (or LCH)), etc.

In the present disclosure, the terms of “configuration” (or“designation”) may be interpreted broadly as a form in which the basestation informs the terminal through a predefined (physical layer orhigher layer) channel/signal (for example, SIB, RRC, MAC CE) (and/or aform provided through pre-configuration and/or a form in which the UEinforms other UEs through a predefined (physical layer or higher layer)channel/signal (for example, SL MAC CE, PC5 RRC)), etc.

In this disclosure, the terms of PSFCH may be interpreted broadly as (NRor LTE) PSSCH (and/or (NR or LTE) PSCCH) (and/or (NR or LTE) SL SSB(and/or UL channel/signal)).

The proposed methods of the present disclosure can be used incombination with each other (in a new form of a method).

In this disclosure, the terms of power saving and/or SL DRX may beinterpreted broadly as resource selection based on partial sensingand/or resource selection based on random selection.

According to various embodiments of the present disclosure, when theP-UE performing CPS is not guaranteed the minimum number of slotsrequired for sensing, the P-UE may select a resource within theselection window based on random selection or may select a resourcewithin Y slots within the selection window based on a sensing result fora number of slots smaller than the minimum number of slots. Byperforming the above operation according to the situation of the P-UE, apower saving effect can be obtained or the reliability of SLcommunication can be obtained as much as possible.

FIG. 13 illustrates a method for a first device to perform wirelesscommunication, according to an embodiment of the present disclosure. Theembodiment of FIG. 13 may be combined with various embodiments of thepresent disclosure.

Referring to FIG. 13, in step S1310, the first device may triggerresource selection in the first slot. In step S1320, the first devicemay determine a time interval of the selection window from the firstslot, based on a remaining packet delay budget (PDB). For example, theselection window may include Y candidate slots. In step S1330, the firstdevice may perform sensing for L slots after the first slot. In stepS1340, the first device may select at least one resource for sidelink(SL) transmission within the selection window based on the sensing forthe L slots. In step S1350, the first device may transmit, to the seconddevice through a physical sidelink control channel (PSCCH), the firstSCI for scheduling of a physical sidelink shared channel (PSSCH) andsecond sidelink control information (SCI). In step S1360, the firstdevice may transmit the second SCI and data to the second device throughthe PSSCH. For example, based on the L is smaller than the minimumnumber of slots for the sensing, the at least one resource may beselected based on a random selection within the selection window, or theat least one resource may be selected within the Y candidate slots basedon the sensing for the L slots. The Y may be a positive integer. The Lmay be a positive integer.

For example, the L slots may be L slots belonging to a resource poollocated after the first slot.

For example, the number of slots belonging to the resource pool betweenthe first slot and the first slot among the Y candidate slots in theselection window may be smaller than the minimum number of the slots.

For example, the first slot among the Y candidate slots may be locatedafter the first processing time and the second processing time from thelast slot among the L slots. For example, the first processing time maybe a time required for the first device to process a result of thesensing, the second processing time may be a time required forprocessing of the first device to select the at least one resource basedon the result of the sensing.

Additionally, for example, the first device may obtain an SLdiscontinuous reception (DRX) configuration including informationrelated to an active time of the second device. For example, the atleast one resource may include at least one first resource selectedwithin the active time and at least one second resource selected outsidethe active time. For example, a ratio between the number of the at leastone first resource and the number of the at least one second resourcemay be configured for the first device. For example, the minimum numberof the at least one first resource or the number of the at least onesecond resource may be configured for the first device.

For example, the minimum number of the Y candidate slots may beconfigured for the first device.

For example, the Y candidate slots may be selected by the first deviceso that the L may be greater than or equal to the minimum number ofslots for the sensing.

For example, the minimum number of slots may be configured for the firstdevice.

For example, the minimum number of slots may be configured for eachresource pool.

The proposed method may be applied to an apparatus according to variousembodiments of the present disclosure. First, the processor 102 of thefirst device 100 may trigger resource selection in the first slot. Inaddition, the processor 102 of the first device 100 may determine a timeinterval of the selection window from the first slot based on aremaining packet delay budget (PDB). For example, the selection windowmay include Y candidate slots. In addition, the processor 102 of thefirst device 100 may perform sensing for L slots after the first slot.In addition, the processor 102 of the first device 100 may select atleast one resource for sidelink (SL) transmission within the selectionwindow based on the sensing of the L slots. In addition, the processor102 of the first device 100 may control the transceiver 106 to transmit,to a second device, a first SCI for scheduling of a physical sidelinkshared channel (PSSCH) and a second sidelink control information (SCI)through a physical sidelink control channel (PSCCH). In addition, theprocessor 102 of the first device 100 may control the transceiver 106 totransmit, to the second device, the second SCI and data through thePSSCH. For example, based on that the L is smaller than the minimumnumber of slots for sensing, the at least one resource may be selectedbased on a random selection within the selection window, or the at leastone resource may be selected within the Y candidate slots based on thesensing for the L slots. The Y may be a positive integer. The L may be apositive integer.

According to an embodiment of the present disclosure, a first device forperforming wireless communication may be provided. For example, thefirst device may comprise one or more memories storing instructions; oneor more transceivers; and one or more processors connected to the one ormore memories and the one or more transceivers. For example, the one ormore processors may execute the instructions to: trigger resourceselection in a first slot; determine a time interval of a selectionwindow from the first slot based on a remaining packet delay budget(PDB), wherein the selection window includes Y candidate slots; performsensing for L slots after the first slot; select at least one resourcefor sidelink (SL) transmission within the selection window based on thesensing for the L slots; transmit, to a second device through a physicalsidelink control channel (PSCCH), a first sidelink control information(SCI) for scheduling of a physical sidelink shared channel (PSSCH) and asecond SCI; and transmit, to the second device through the PSSCH, thesecond SCI and data. For example, based on the L being smaller than aminimum number of slots for the sensing, the at least one resource maybe selected based on random selection within the selection window, orthe at least one resource may be selected from the Y candidate slotsbased on the sensing for the L slots. The Y may be a positive integer.The L may be a positive integer.

According to an embodiment of the present disclosure, an apparatusconfigured to control a first user equipment (UE) performing wirelesscommunication may be provided. For example, the apparatus may comprise:one or more processors; and one or more memories operably connected tothe one or more processors and storing instructions. For example, theone or more processors may execute the instructions to: trigger resourceselection in a first slot; determine a time interval of a selectionwindow from the first slot based on a remaining packet delay budget(PDB), wherein the selection window includes Y candidate slots; performsensing for L slots after the first slot; select at least one resourcefor sidelink (SL) transmission within the selection window based on thesensing for the L slots; transmit, to a second device through a physicalsidelink control channel (PSCCH), a first sidelink control information(SCI) for scheduling of a physical sidelink shared channel (PSSCH) and asecond SCI; and transmit, to the second device through the PSSCH, thesecond SCI and data. For example, based on the L being smaller than aminimum number of slots for the sensing, the at least one resource maybe selected based on random selection within the selection window, orthe at least one resource may be selected from the Y candidate slotsbased on the sensing for the L slots. The Y may be a positive integer,and the L may be a positive integer.

According to an embodiment of the present disclosure, a non-transitorycomputer-readable storage medium storing instructions may be provided.For example, the instructions, when executed, cause a first device to:trigger resource selection in a first slot; determine a time interval ofa selection window from the first slot based on a remaining packet delaybudget (PDB), wherein the selection window includes Y candidate slots;perform sensing for L slots after the first slot; select at least oneresource for sidelink (SL) transmission within the selection windowbased on the sensing for the L slots; transmit, to a second devicethrough a physical sidelink control channel (PSCCH), a first sidelinkcontrol information (SCI) for scheduling of a physical sidelink sharedchannel (PSSCH) and a second SCI; and transmit, to the second devicethrough the PSSCH, the second SCI and data. For example, based on the Lbeing smaller than a minimum number of slots for the sensing, the atleast one resource may be selected based on random selection within theselection window, or the at least one resource may be selected from theY candidate slots based on the sensing for the L slots. The Y may be apositive integer, and the L may be a positive integer.

FIG. 14 shows a method for a second device to perform wirelesscommunication, according to an embodiment of the present disclosure. Theembodiment of FIG. 14 may be combined with various embodiments of thepresent disclosure.

Referring to FIG. 14, in step S1410, the second device may receive, froma first device, a first SCI for scheduling a physical sidelink sharedchannel (PSSCH) and second sidelink control information (SCI) through aphysical sidelink control channel (PSCCH) based on a sidelink (SL)resource. In step S1420, the second device may receive the second SCIand data from the first device through the PSSCH based on the SLresource. For example, the SL resource may be selected within aselection window based on sensing of L slots related to the selectionwindow including Y candidate slots. For example, based on that the L issmaller than the minimum number of slots for the sensing, the SLresource may be selected based on random selection within the selectionwindow, or the SL resource may be selected among the Y candidate slotsbased on the sensing of the L slots. The Y may be a positive integer,and the L may be a positive integer.

The proposed method may be applied to an apparatus according to variousembodiments of the present disclosure. First, the processor 202 of thesecond device 200 may control the transceiver 206 to receive, from afirst device, a first SCI for scheduling a physical sidelink sharedchannel (PSSCH) and second sidelink control information (SCI) through aphysical sidelink control channel (PSCCH) based on a sidelink (SL)resource. And the processor 202 of the second device 200 may control thetransceiver 206 to receive the second SCI and data from the first devicethrough the PSSCH based on the SL resource. For example, the SL resourcemay be selected within a selection window based on sensing of L slotsrelated to the selection window including Y candidate slots. Forexample, based on that the L is smaller than the minimum number of slotsfor the sensing, the SL resource may be selected based on randomselection within the selection window, or the SL resource may beselected among the Y candidate slots based on the sensing of the Lslots. The Y may be a positive integer, and the L may be a positiveinteger.

According to an embodiment of the present disclosure, a second deviceconfigured to perform wireless communication may be provided. Forexample, the second device may comprise one or more memories storinginstructions; one or more transceivers; and one or more processorsconnected to the one or more memories and the one or more transceivers.For example, the one or more processors execute the instructions to:receive, from a first device, a first SCI for scheduling a physicalsidelink shared channel (PSSCH) and second sidelink control information(SCI) through a physical sidelink control channel (PSCCH) based on asidelink (SL) resource; and receive the second SCI and data from thefirst device through the PSSCH based on the SL resource. For example,the SL resource may be selected within a selection window based onsensing for L slots related to the selection window including Ycandidate slots. For example, based on that the L is smaller than theminimum number of slots for the sensing, the SL resource may be selectedbased on random selection within the selection window, or the SLresource may be selected among the Y candidate slots based on thesensing of the L slots. The Y may be a positive integer, and the L maybe a positive integer.

According to an embodiment of the present disclosure, an apparatusconfigured to control a second user equipment (UE) performing wirelesscommunication may be provided. For example, the apparatus may comprise:one or more processors; and one or more memories operably connected tothe one or more processors and storing instructions. For example, theone or more processors may execute the instructions to: receive, fromthe first UE, a first SCI for scheduling a physical sidelink sharedchannel (PSSCH) and second sidelink control information (SCI) through aphysical sidelink control channel (PSCCH) based on a sidelink (SL)resource; and receive the second SCI and data from the UE device throughthe PSSCH based on the SL resource. For example, the SL resource may beselected within a selection window based on sensing for L slots relatedto the selection window including Y candidate slots. For example, basedon that the L is smaller than the minimum number of slots for thesensing, the SL resource may be selected based on random selectionwithin the selection window, or the SL resource may be selected amongthe Y candidate slots based on the sensing of the L slots. The Y may bea positive integer, and the L may be a positive integer.

According to an embodiment of the present disclosure, a non-transitorycomputer-readable storage medium storing instructions may be provided.For example, the instructions, when executed, cause a second device to:receive, from a first device, a first SCI for scheduling a physicalsidelink shared channel (PSSCH) and second sidelink control information(SCI) through a physical sidelink control channel (PSCCH) based on asidelink (SL) resource; and receive the second SCI and data from thefirst device through the PSSCH based on the SL resource. For example,the SL resource may be selected within a selection window based onsensing for L slots related to the selection window including Ycandidate slots. For example, based on that the L is smaller than theminimum number of slots for the sensing, the SL resource may be selectedbased on random selection within the selection window, or the SLresource may be selected among the Y candidate slots based on thesensing of the L slots. The Y may be a positive integer, and the L maybe a positive integer.

Various embodiments of the present disclosure may be combined with eachother.

Hereinafter, device(s) to which various embodiments of the presentdisclosure can be applied will be described.

The various descriptions, functions, procedures, proposals, methods,and/or operational flowcharts of the present disclosure described inthis document may be applied to, without being limited to, a variety offields requiring wireless communication/connection (e.g., 5G) betweendevices.

Hereinafter, a description will be given in more detail with referenceto the drawings. In the following drawings/description, the samereference symbols may denote the same or corresponding hardware blocks,software blocks, or functional blocks unless described otherwise.

FIG. 15 shows a communication system 1, based on an embodiment of thepresent disclosure.

Referring to FIG. 15, a communication system 1 to which variousembodiments of the present disclosure are applied includes wirelessdevices, Base Stations (BSs), and a network. Herein, the wirelessdevices represent devices performing communication using Radio AccessTechnology (RAT) (e.g., 5G New RAT (NR)) or Long-Term Evolution (LTE))and may be referred to as communication/radio/5G devices. The wirelessdevices may include, without being limited to, a robot 100 a, vehicles100 b-1 and 100 b-2, an eXtended Reality (XR) device 100 c, a hand-helddevice 100 d, a home appliance 100 e, an Internet of Things (IoT) device100 f, and an Artificial Intelligence (AI) device/server 400. Forexample, the vehicles may include a vehicle having a wirelesscommunication function, an autonomous vehicle, and a vehicle capable ofperforming communication between vehicles. Herein, the vehicles mayinclude an Unmanned Aerial Vehicle (UAV) (e.g., a drone). The XR devicemay include an Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality(MR) device and may be implemented in the form of a Head-Mounted Device(HMD), a Head-Up Display (HUD) mounted in a vehicle, a television, asmartphone, a computer, a wearable device, a home appliance device, adigital signage, a vehicle, a robot, etc. The hand-held device mayinclude a smartphone, a smartpad, a wearable device (e.g., a smartwatchor a smartglasses), and a computer (e.g., a notebook). The homeappliance may include a TV, a refrigerator, and a washing machine. TheIoT device may include a sensor and a smartmeter. For example, the BSsand the network may be implemented as wireless devices and a specificwireless device 200 a may operate as a B S/network node with respect toother wireless devices.

Here, wireless communication technology implemented in wireless devices100 a to 100 f of the present disclosure may include Narrowband Internetof Things for low-power communication in addition to LTE, NR, and 6G. Inthis case, for example, NB-IoT technology may be an example of Low PowerWide Area Network (LPWAN) technology and may be implemented as standardssuch as LTE Cat NB1, and/or LTE Cat NB2, and is not limited to the namedescribed above. Additionally or alternatively, the wirelesscommunication technology implemented in the wireless devices 100 a to100 f of the present disclosure may perform communication based on LTE-Mtechnology. In this case, as an example, the LTE-M technology may be anexample of the LPWAN and may be called by various names includingenhanced Machine Type Communication (eMTC), and the like. For example,the LTE-M technology may be implemented as at least any one of variousstandards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTEnon-Bandwidth Limited (non-BL), 5) LTE-MTC, 6) LTE Machine TypeCommunication, and/or 7) LTE M, and is not limited to the name describedabove. Additionally or alternatively, the wireless communicationtechnology implemented in the wireless devices 100 a to 100 f of thepresent disclosure may include at least one of Bluetooth, Low Power WideArea Network (LPWAN), and ZigBee considering the low-powercommunication, and is not limited to the name described above. As anexample, the ZigBee technology may generate personal area networks (PAN)related to small/low-power digital communication based on variousstandards including IEEE 802.15.4, and the like, and may be called byvarious names.

The wireless devices 100 a to 100 f may be connected to the network 300via the BSs 200. An AI technology may be applied to the wireless devices100 a to 100 f and the wireless devices 100 a to 100 f may be connectedto the AI server 400 via the network 300. The network 300 may beconfigured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g.,NR) network. Although the wireless devices 100 a to 100 f maycommunicate with each other through the BSs 200/network 300, thewireless devices 100 a to 100 f may perform direct communication (e.g.,sidelink communication) with each other without passing through theBSs/network. For example, the vehicles 100 b-1 and 100 b-2 may performdirect communication (e.g. Vehicle-to-Vehicle(V2V)/Vehicle-to-everything (V2X) communication). The IoT device (e.g.,a sensor) may perform direct communication with other IoT devices (e.g.,sensors) or other wireless devices 100 a to 100 f.

Wireless communication/connections 150 a, 150 b, or 150 c may beestablished between the wireless devices 100 a to 100 f/BS 200, or BS200/BS 200. Herein, the wireless communication/connections may beestablished through various RATs (e.g., 5G NR) such as uplink/downlinkcommunication 150 a, sidelink communication 150 b (or, D2Dcommunication), or inter BS communication (e.g. relay, Integrated AccessBackhaul (IAB)). The wireless devices and the BSs/the wireless devicesmay transmit/receive radio signals to/from each other through thewireless communication/connections 150 a and 150 b. For example, thewireless communication/connections 150 a and 150 b may transmit/receivesignals through various physical channels. To this end, at least a partof various configuration information configuring processes, varioussignal processing processes (e.g., channel encoding/decoding,modulation/demodulation, and resource mapping/demapping), and resourceallocating processes, for transmitting/receiving radio signals, may beperformed based on the various proposals of the present disclosure.

FIG. 16 shows wireless devices, based on an embodiment of the presentdisclosure.

Referring to FIG. 16, a first wireless device 100 and a second wirelessdevice 200 may transmit radio signals through a variety of RATs (e.g.,LTE and NR). Herein, {the first wireless device 100 and the secondwireless device 200} may correspond to {the wireless device 100 x andthe BS 200} and/or {the wireless device 100 x and the wireless device100 x} of FIG. 15.

The first wireless device 100 may include one or more processors 102 andone or more memories 104 and additionally further include one or moretransceivers 106 and/or one or more antennas 108. The processor(s) 102may control the memory(s) 104 and/or the transceiver(s) 106 and may beconfigured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 102 may process informationwithin the memory(s) 104 to generate first information/signals and thentransmit radio signals including the first information/signals throughthe transceiver(s) 106. The processor(s) 102 may receive radio signalsincluding second information/signals through the transceiver 106 andthen store information obtained by processing the secondinformation/signals in the memory(s) 104. The memory(s) 104 may beconnected to the processor(s) 102 and may store a variety of informationrelated to operations of the processor(s) 102. For example, thememory(s) 104 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 102or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 102 and the memory(s) 104 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 106 may be connected to the processor(s) 102 andtransmit and/or receive radio signals through one or more antennas 108.Each of the transceiver(s) 106 may include a transmitter and/or areceiver. The transceiver(s) 106 may be interchangeably used with RadioFrequency (RF) unit(s). In the present disclosure, the wireless devicemay represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202and one or more memories 204 and additionally further include one ormore transceivers 206 and/or one or more antennas 208. The processor(s)202 may control the memory(s) 204 and/or the transceiver(s) 206 and maybe configured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 202 may process informationwithin the memory(s) 204 to generate third information/signals and thentransmit radio signals including the third information/signals throughthe transceiver(s) 206. The processor(s) 202 may receive radio signalsincluding fourth information/signals through the transceiver(s) 106 andthen store information obtained by processing the fourthinformation/signals in the memory(s) 204. The memory(s) 204 may beconnected to the processor(s) 202 and may store a variety of informationrelated to operations of the processor(s) 202. For example, thememory(s) 204 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 202or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 202 and the memory(s) 204 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 206 may be connected to the processor(s) 202 andtransmit and/or receive radio signals through one or more antennas 208.Each of the transceiver(s) 206 may include a transmitter and/or areceiver. The transceiver(s) 206 may be interchangeably used with RFunit(s). In the present disclosure, the wireless device may represent acommunication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 willbe described more specifically. One or more protocol layers may beimplemented by, without being limited to, one or more processors 102 and202. For example, the one or more processors 102 and 202 may implementone or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP,RRC, and SDAP). The one or more processors 102 and 202 may generate oneor more Protocol Data Units (PDUs) and/or one or more Service Data Unit(SDUs) according to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document. Theone or more processors 102 and 202 may generate messages, controlinformation, data, or information according to the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document. The one or more processors 102 and 202 maygenerate signals (e.g., baseband signals) including PDUs, SDUs,messages, control information, data, or information according to thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document and provide thegenerated signals to the one or more transceivers 106 and 206. The oneor more processors 102 and 202 may receive the signals (e.g., basebandsignals) from the one or more transceivers 106 and 206 and acquire thePDUs, SDUs, messages, control information, data, or informationaccording to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.

The one or more processors 102 and 202 may be referred to ascontrollers, microcontrollers, microprocessors, or microcomputers. Theone or more processors 102 and 202 may be implemented by hardware,firmware, software, or a combination thereof. As an example, one or moreApplication Specific Integrated Circuits (ASICs), one or more DigitalSignal Processors (DSPs), one or more Digital Signal Processing Devices(DSPDs), one or more Programmable Logic Devices (PLDs), or one or moreField Programmable Gate Arrays (FPGAs) may be included in the one ormore processors 102 and 202. The descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument may be implemented using firmware or software and the firmwareor software may be configured to include the modules, procedures, orfunctions. Firmware or software configured to perform the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be included in the one or more processors102 and 202 or stored in the one or more memories 104 and 204 so as tobe driven by the one or more processors 102 and 202. The descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be implemented using firmware or softwarein the form of code, commands, and/or a set of commands.

The one or more memories 104 and 204 may be connected to the one or moreprocessors 102 and 202 and store various types of data, signals,messages, information, programs, code, instructions, and/or commands.The one or more memories 104 and 204 may be configured by Read-OnlyMemories (ROMs), Random Access Memories (RAMs), Electrically ErasableProgrammable Read-Only Memories (EPROMs), flash memories, hard drives,registers, cash memories, computer-readable storage media, and/orcombinations thereof. The one or more memories 104 and 204 may belocated at the interior and/or exterior of the one or more processors102 and 202. The one or more memories 104 and 204 may be connected tothe one or more processors 102 and 202 through various technologies suchas wired or wireless connection.

The one or more transceivers 106 and 206 may transmit user data, controlinformation, and/or radio signals/channels, mentioned in the methodsand/or operational flowcharts of this document, to one or more otherdevices. The one or more transceivers 106 and 206 may receive user data,control information, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, from one or moreother devices. For example, the one or more transceivers 106 and 206 maybe connected to the one or more processors 102 and 202 and transmit andreceive radio signals. For example, the one or more processors 102 and202 may perform control so that the one or more transceivers 106 and 206may transmit user data, control information, or radio signals to one ormore other devices. The one or more processors 102 and 202 may performcontrol so that the one or more transceivers 106 and 206 may receiveuser data, control information, or radio signals from one or more otherdevices. The one or more transceivers 106 and 206 may be connected tothe one or more antennas 108 and 208 and the one or more transceivers106 and 206 may be configured to transmit and receive user data, controlinformation, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, through the one ormore antennas 108 and 208. In this document, the one or more antennasmay be a plurality of physical antennas or a plurality of logicalantennas (e.g., antenna ports). The one or more transceivers 106 and 206may convert received radio signals/channels etc. from RF band signalsinto baseband signals in order to process received user data, controlinformation, radio signals/channels, etc. using the one or moreprocessors 102 and 202. The one or more transceivers 106 and 206 mayconvert the user data, control information, radio signals/channels, etc.processed using the one or more processors 102 and 202 from the baseband signals into the RF band signals. To this end, the one or moretransceivers 106 and 206 may include (analog) oscillators and/orfilters.

FIG. 17 shows a signal process circuit for a transmission signal, basedon an embodiment of the present disclosure.

Referring to FIG. 17, a signal processing circuit 1000 may includescramblers 1010, modulators 1020, a layer mapper 1030, a precoder 1040,resource mappers 1050, and signal generators 1060. An operation/functionof FIG. 17 may be performed, without being limited to, the processors102 and 202 and/or the transceivers 106 and 206 of FIG. 16. Hardwareelements of FIG. 17 may be implemented by the processors 102 and 202and/or the transceivers 106 and 206 of FIG. 16. For example, blocks 1010to 1060 may be implemented by the processors 102 and 202 of FIG. 16.Alternatively, the blocks 1010 to 1050 may be implemented by theprocessors 102 and 202 of FIG. 16 and the block 1060 may be implementedby the transceivers 106 and 206 of FIG. 16.

Codewords may be converted into radio signals via the signal processingcircuit 1000 of FIG. 17. Herein, the codewords are encoded bit sequencesof information blocks. The information blocks may include transportblocks (e.g., a UL-SCH transport block, a DL-SCH transport block). Theradio signals may be transmitted through various physical channels(e.g., a PUSCH and a PDSCH).

Specifically, the codewords may be converted into scrambled bitsequences by the scramblers 1010. Scramble sequences used for scramblingmay be generated based on an initialization value, and theinitialization value may include ID information of a wireless device.The scrambled bit sequences may be modulated to modulation symbolsequences by the modulators 1020. A modulation scheme may includepi/2-Binary Phase Shift Keying (pi/2-BPSK), m-Phase Shift Keying(m-PSK), and m-Quadrature Amplitude Modulation (m-QAM). Complexmodulation symbol sequences may be mapped to one or more transportlayers by the layer mapper 1030. Modulation symbols of each transportlayer may be mapped (precoded) to corresponding antenna port(s) by theprecoder 1040. Outputs z of the precoder 1040 may be obtained bymultiplying outputs y of the layer mapper 1030 by an N*M precodingmatrix W. Herein, N is the number of antenna ports and M is the numberof transport layers. The precoder 1040 may perform precoding afterperforming transform precoding (e.g., DFT) for complex modulationsymbols. Alternatively, the precoder 1040 may perform precoding withoutperforming transform precoding.

The resource mappers 1050 may map modulation symbols of each antennaport to time-frequency resources. The time-frequency resources mayinclude a plurality of symbols (e.g., a CP-OFDMA symbols and DFT-s-OFDMAsymbols) in the time domain and a plurality of subcarriers in thefrequency domain. The signal generators 1060 may generate radio signalsfrom the mapped modulation symbols and the generated radio signals maybe transmitted to other devices through each antenna. For this purpose,the signal generators 1060 may include Inverse Fast Fourier Transform(IFFT) modules, Cyclic Prefix (CP) inserters, Digital-to-AnalogConverters (DACs), and frequency up-converters.

Signal processing procedures for a signal received in the wirelessdevice may be configured in a reverse manner of the signal processingprocedures 1010 to 1060 of FIG. 17. For example, the wireless devices(e.g., 100 and 200 of FIG. 16) may receive radio signals from theexterior through the antenna ports/transceivers. The received radiosignals may be converted into baseband signals through signal restorers.To this end, the signal restorers may include frequency downlinkconverters, Analog-to-Digital Converters (ADCs), CP remover, and FastFourier Transform (FFT) modules. Next, the baseband signals may berestored to codewords through a resource demapping procedure, apostcoding procedure, a demodulation processor, and a descramblingprocedure. The codewords may be restored to original information blocksthrough decoding. Therefore, a signal processing circuit (notillustrated) for a reception signal may include signal restorers,resource demappers, a postcoder, demodulators, descramblers, anddecoders.

FIG. 18 shows another example of a wireless device, based on anembodiment of the present disclosure. The wireless device may beimplemented in various forms according to a use-case/service (refer toFIG. 15).

Referring to FIG. 18, wireless devices 100 and 200 may correspond to thewireless devices 100 and 200 of FIG. 16 and may be configured by variouselements, components, units/portions, and/or modules. For example, eachof the wireless devices 100 and 200 may include a communication unit110, a control unit 120, a memory unit 130, and additional components140. The communication unit may include a communication circuit 112 andtransceiver(s) 114. For example, the communication circuit 112 mayinclude the one or more processors 102 and 202 and/or the one or morememories 104 and 204 of FIG. 16. For example, the transceiver(s) 114 mayinclude the one or more transceivers 106 and 206 and/or the one or moreantennas 108 and 208 of FIG. 16. The control unit 120 is electricallyconnected to the communication unit 110, the memory 130, and theadditional components 140 and controls overall operation of the wirelessdevices. For example, the control unit 120 may control anelectric/mechanical operation of the wireless device based onprograms/code/commands/information stored in the memory unit 130. Thecontrol unit 120 may transmit the information stored in the memory unit130 to the exterior (e.g., other communication devices) via thecommunication unit 110 through a wireless/wired interface or store, inthe memory unit 130, information received through the wireless/wiredinterface from the exterior (e.g., other communication devices) via thecommunication unit 110.

The additional components 140 may be variously configured according totypes of wireless devices. For example, the additional components 140may include at least one of a power unit/battery, input/output (I/O)unit, a driving unit, and a computing unit. The wireless device may beimplemented in the form of, without being limited to, the robot (100 aof FIG. 15), the vehicles (100 b-1 and 100 b-2 of FIG. 15), the XRdevice (100 c of FIG. 15), the hand-held device (100 d of FIG. 15), thehome appliance (100 e of FIG. 15), the IoT device (100 f of FIG. 15), adigital broadcast terminal, a hologram device, a public safety device,an MTC device, a medicine device, a fintech device (or a financedevice), a security device, a climate/environment device, the AIserver/device (400 of FIG. 15), the BSs (200 of FIG. 15), a networknode, etc. The wireless device may be used in a mobile or fixed placeaccording to a use-example/service.

In FIG. 18, the entirety of the various elements, components,units/portions, and/or modules in the wireless devices 100 and 200 maybe connected to each other through a wired interface or at least a partthereof may be wirelessly connected through the communication unit 110.For example, in each of the wireless devices 100 and 200, the controlunit 120 and the communication unit 110 may be connected by wire and thecontrol unit 120 and first units (e.g., 130 and 140) may be wirelesslyconnected through the communication unit 110. Each element, component,unit/portion, and/or module within the wireless devices 100 and 200 mayfurther include one or more elements. For example, the control unit 120may be configured by a set of one or more processors. As an example, thecontrol unit 120 may be configured by a set of a communication controlprocessor, an application processor, an Electronic Control Unit (ECU), agraphical processing unit, and a memory control processor. As anotherexample, the memory 130 may be configured by a Random Access Memory(RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM)), a flash memory,a volatile memory, a non-volatile memory, and/or a combination thereof.

Hereinafter, an example of implementing FIG. 18 will be described indetail with reference to the drawings.

FIG. 19 shows a hand-held device, based on an embodiment of the presentdisclosure. The hand-held device may include a smartphone, a smartpad, awearable device (e.g., a smartwatch or a smartglasses), or a portablecomputer (e.g., a notebook). The hand-held device may be referred to asa mobile station (MS), a user terminal (UT), a Mobile Subscriber Station(MSS), a Subscriber Station (SS), an Advanced Mobile Station (AMS), or aWireless Terminal (WT).

Referring to FIG. 19, a hand-held device 100 may include an antenna unit108, a communication unit 110, a control unit 120, a memory unit 130, apower supply unit 140 a, an interface unit 140 b, and an I/O unit 140 c.The antenna unit 108 may be configured as a part of the communicationunit 110. Blocks 110 to 130/140 a to 140 c correspond to the blocks 110to 130/140 of FIG. 18, respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from other wireless devices or BSs. Thecontrol unit 120 may perform various operations by controllingconstituent elements of the hand-held device 100. The control unit 120may include an Application Processor (AP). The memory unit 130 may storedata/parameters/programs/code/commands needed to drive the hand-helddevice 100. The memory unit 130 may store input/output data/information.The power supply unit 140 a may supply power to the hand-held device 100and include a wired/wireless charging circuit, a battery, etc. Theinterface unit 140 b may support connection of the hand-held device 100to other external devices. The interface unit 140 b may include variousports (e.g., an audio I/O port and a video I/O port) for connection withexternal devices. The I/O unit 140 c may input or output videoinformation/signals, audio information/signals, data, and/or informationinput by a user. The I/O unit 140 c may include a camera, a microphone,a user input unit, a display unit 140 d, a speaker, and/or a hapticmodule.

As an example, in the case of data communication, the I/O unit 140 c mayacquire information/signals (e.g., touch, text, voice, images, or video)input by a user and the acquired information/signals may be stored inthe memory unit 130. The communication unit 110 may convert theinformation/signals stored in the memory into radio signals and transmitthe converted radio signals to other wireless devices directly or to aBS. The communication unit 110 may receive radio signals from otherwireless devices or the BS and then restore the received radio signalsinto original information/signals. The restored information/signals maybe stored in the memory unit 130 and may be output as various types(e.g., text, voice, images, video, or haptic) through the I/O unit 140c.

FIG. 20 shows a vehicle or an autonomous vehicle, based on an embodimentof the present disclosure. The vehicle or autonomous vehicle may beimplemented by a mobile robot, a car, a train, a manned/unmanned AerialVehicle (AV), a ship, etc.

Referring to FIG. 20, a vehicle or autonomous vehicle 100 may include anantenna unit 108, a communication unit 110, a control unit 120, adriving unit 140 a, a power supply unit 140 b, a sensor unit 140 c, andan autonomous driving unit 140 d. The antenna unit 108 may be configuredas a part of the communication unit 110. The blocks 110/130/140 a to 140d correspond to the blocks 110/130/140 of FIG. 18, respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from external devices such as othervehicles, BSs (e.g., gNBs and road side units), and servers. The controlunit 120 may perform various operations by controlling elements of thevehicle or the autonomous vehicle 100. The control unit 120 may includean Electronic Control Unit (ECU). The driving unit 140 a may cause thevehicle or the autonomous vehicle 100 to drive on a road. The drivingunit 140 a may include an engine, a motor, a powertrain, a wheel, abrake, a steering device, etc. The power supply unit 140 b may supplypower to the vehicle or the autonomous vehicle 100 and include awired/wireless charging circuit, a battery, etc. The sensor unit 140 cmay acquire a vehicle state, ambient environment information, userinformation, etc. The sensor unit 140 c may include an InertialMeasurement Unit (IMU) sensor, a collision sensor, a wheel sensor, aspeed sensor, a slope sensor, a weight sensor, a heading sensor, aposition module, a vehicle forward/backward sensor, a battery sensor, afuel sensor, a tire sensor, a steering sensor, a temperature sensor, ahumidity sensor, an ultrasonic sensor, an illumination sensor, a pedalposition sensor, etc. The autonomous driving unit 140 d may implementtechnology for maintaining a lane on which a vehicle is driving,technology for automatically adjusting speed, such as adaptive cruisecontrol, technology for autonomously driving along a determined path,technology for driving by automatically setting a path if a destinationis set, and the like.

For example, the communication unit 110 may receive map data, trafficinformation data, etc. from an external server. The autonomous drivingunit 140 d may generate an autonomous driving path and a driving planfrom the obtained data. The control unit 120 may control the drivingunit 140 a such that the vehicle or the autonomous vehicle 100 may movealong the autonomous driving path according to the driving plan (e.g.,speed/direction control). In the middle of autonomous driving, thecommunication unit 110 may aperiodically/periodically acquire recenttraffic information data from the external server and acquiresurrounding traffic information data from neighboring vehicles. In themiddle of autonomous driving, the sensor unit 140 c may obtain a vehiclestate and/or surrounding environment information. The autonomous drivingunit 140 d may update the autonomous driving path and the driving planbased on the newly obtained data/information. The communication unit 110may transfer information about a vehicle position, the autonomousdriving path, and/or the driving plan to the external server. Theexternal server may predict traffic information data using AItechnology, etc., based on the information collected from vehicles orautonomous vehicles and provide the predicted traffic information datato the vehicles or the autonomous vehicles.

Claims in the present description can be combined in a various way. Forinstance, technical features in method claims of the present descriptioncan be combined to be implemented or performed in an apparatus, andtechnical features in apparatus claims can be combined to be implementedor performed in a method. Further, technical features in method claim(s)and apparatus claim(s) can be combined to be implemented or performed inan apparatus. Further, technical features in method claim(s) andapparatus claim(s) can be combined to be implemented or performed in amethod.

What is claimed is:
 1. A method for performing wireless communication bya first device, the method comprising: triggering resource selection ina first slot; determining a time interval of a selection window from thefirst slot based on a remaining packet delay budget (PDB), wherein theselection window includes Y candidate slots; performing sensing for Lslots after the first slot; selecting at least one resource for sidelink(SL) transmission within the selection window based on the sensing forthe L slots; transmitting, to a second device through a physicalsidelink control channel (PSCCH), a first sidelink control information(SCI) for scheduling of a physical sidelink shared channel (PSSCH) and asecond SCI; and transmitting, to the second device through the PSSCH,the second SCI and data; wherein, based on the L being smaller than aminimum number of slots for the sensing, the at least one resource isselected based on random selection within the selection window, or theat least one resource is selected from the Y candidate slots based onthe sensing for the L slots, wherein the Y is a positive integer, andwherein the L is a positive integer.
 2. The method of claim 1, whereinthe L slots are L slots belonging to a resource pool, located after thefirst slot.
 3. The method of claim 1, wherein a number of slotsbelonging to a resource pool between the first slot and a first of the Ycandidate slots in the selection window is smaller than the minimumnumber of slots.
 4. The method of claim 1, wherein a first slot amongthe Y candidate slots is located after a first processing time and asecond processing time from a last slot among the L slots.
 5. The methodof claim 4, wherein the first processing time is the time required forthe first device to process a result of the sensing, and wherein thesecond processing time is a time required for the first device to selectthe at least one resource based on the result of the sensing.
 6. Themethod of claim 1, wherein the method further comprises, obtaining an SLdiscontinuous reception (DRX) configuration including informationrelated to an active time of the second device.
 7. The method of claim6, wherein the at least one resource includes at least one firstresource selected within the active time and at least one secondresource selected outside the active time.
 8. The method of claim 7,wherein a ratio between a number of the at least one first resource anda number of the at least one second resource is configured for the firstdevice.
 9. The method of claim 7, wherein a minimum number of the atleast one first resource or a number of the at least one second resourceis configured for the first device.
 10. The method of claim 1, wherein aminimum number of the Y candidate slots is configured for the firstdevice.
 11. The method of claim 1, wherein the Y candidate slots areselected by the first device so that the L is greater than or equal tothe minimum number of slots for the sensing.
 12. The method of claim 1,wherein the minimum number of slots is configured for the first device.13. The method of claim 1, wherein the minimum number of slots isconfigured for each resource pool.
 14. A first device configured toperform wireless communication, the first device comprising: one or morememories storing instructions; one or more transceivers; and one or moreprocessors connected to the one or more memories and the one or moretransceivers, wherein the one or more processors execute theinstructions to: trigger resource selection in a first slot; determine atime interval of a selection window from the first slot based on aremaining packet delay budget (PDB), wherein the selection windowincludes Y candidate slots; perform sensing for L slots after the firstslot; select at least one resource for sidelink (SL) transmission withinthe selection window based on the sensing for the L slots; transmit, toa second device through a physical sidelink control channel (PSCCH), afirst sidelink control information (SCI) for scheduling of a physicalsidelink shared channel (PSSCH) and a second SCI; and transmit, to thesecond device through the PSSCH, the second SCI and data; wherein, basedon the L being smaller than a minimum number of slots for the sensing,the at least one resource is selected based on random selection withinthe selection window, or the at least one resource is selected from theY candidate slots based on the sensing for the L slots, wherein the Y isa positive integer, and wherein the L is a positive integer.
 15. Thefirst device of claim 14, wherein the L slots are L slots belonging to aresource pool, located after the first slot.
 16. The first device ofclaim 14, wherein a number of slots belonging to a resource pool betweenthe first slot and a first of the Y candidate slots in the selectionwindow is smaller than the minimum number of slots.
 17. The first deviceof claim 14, wherein a first slot among the Y candidate slots is locatedafter a first processing time and a second processing time from a lastslot among the L slots.
 18. The first device of claim 17, wherein thefirst processing time is the time required for the first device toprocess a result of the sensing, and wherein the second processing timeis a time required for the first device to select the at least oneresource based on the result of the sensing.
 19. The first device ofclaim 14, wherein a minimum number of the Y candidate slots isconfigured for the first device.
 20. An apparatus configured to controla first user equipment (UE) performing wireless communication, theapparatus comprising: one or more processors; and one or more memoriesoperably connected to the one or more processors and storinginstructions, wherein the one or more processors execute theinstructions to: trigger resource selection in a first slot; determine atime interval of a selection window from the first slot based on aremaining packet delay budget (PDB), wherein the selection windowincludes Y candidate slots; perform sensing for L slots after the firstslot; select at least one resource for sidelink (SL) transmission withinthe selection window based on the sensing for the L slots; transmit, toa second device through a physical sidelink control channel (PSCCH), afirst sidelink control information (SCI) for scheduling of a physicalsidelink shared channel (PSSCH) and a second SCI; and transmit, to thesecond device through the PSSCH, the second SCI and data; wherein, basedon the L being smaller than a minimum number of slots for the sensing,the at least one resource is selected based on random selection withinthe selection window, or the at least one resource is selected from theY candidate slots based on the sensing for the L slots, wherein the Y isa positive integer, and wherein the L is a positive integer.